Annual report pursuant to Section 13 and 15(d)

Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details Narrative)

v3.19.1
Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details Narrative)
 12 Months Ended
Jul. 26, 2018
$ / shares
shares
May 01, 2018
USD ($)
shares
Jan. 18, 2018
$ / shares
shares
Oct. 19, 2017
$ / shares
shares
Jul. 27, 2017
$ / shares
shares
Jan. 13, 2017
$ / shares
shares
Dec. 31, 2018
USD ($)
Integer
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
May 30, 2018
$ / shares
Jan. 27, 2018
Integer
shares
Jul. 28, 2017
shares
Dec. 31, 2016
shares
Common stock authorized             30,000,000 30,000,000        
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term [1]             4 years 4 months 24 days 4 years 7 months 6 days        
Number of stock option shares granted             18,000 428,000        
Stock options, grants in period, exercise price | $ / shares             $ 4.22 $ 3.64        
Stock options granted contractual term               6 years 7 months 6 days        
Unrecognized compensation cost related to unvested options | $             $ 432,000          
Employee and director service share-based compensation nonvested awards, compensation not yet recognized, stock options, next twelve months | $             131,000          
Employee and director service share-based compensation nonvested awards, compensation not yet recognized, stock options, year two | $             114,000          
Employee and director service share-based compensation nonvested awards, compensation not yet recognized, stock options, year three | $             114,000          
Employee and director service share-based compensation nonvested awards, compensation not yet recognized, stock options, year four | $             $ 73,000          
Common stock exercise price per share | $ / shares                 $ 4.80      
Stock option term, description             The term of the Ferguson Stock Option is seven (7) years from the grant date.          
Consulting expenses included in selling, general and administrative expenses and additional paid-in capital | $               $ 20,000        
Number of stock options that becomes vested upon the tranches the 1st milestones               10,000        
Volatility               52.65%        
Risk free interest rate               2.30%        
Number of options exercised             10,000          
Remaining stock option             616,000 [1] 624,800 [1]       247,200
Allocated share-based compensation expense | $             $ 198,000 $ 124,000        
Number of common shares reserved for future issuance             616,000          
Common Stock [Member]                        
Number of options exercised             10,000          
Stock issued during period for services, shares             60,598 61,598        
Robert Ferguson [Member]                        
Monthly compensation fees | $             $ 4,000          
Stock option shall become exercisable upon attainment of performance milestone                   10,000    
Number of gallons | Integer                   3    
Number of options exercised   10,000                    
Shares purchased from exercise of stock options   10,000                    
Proceeds from exercise of stock options | $   $ 36,500                    
Remaining stock option             90,000          
January 27, 2019 [Member] | Robert Ferguson [Member]                        
Stock option shall become exercisable upon attainment of performance milestone             30,000          
Number of gallons | Integer             2,000          
January 27, 2021 [Member] | Robert Ferguson [Member]                        
Stock option shall become exercisable upon attainment of performance milestone             60,000          
Number of gallons | Integer             50,000          
2003 Outside Directors Stock Plan [Member]                        
Stock options granted vesting period             180 days          
Stock options, expiration period             10 years          
Share-based compensation arrangement by share-based payment award percentage of stock in lieu of fee payable             65.00%          
Percentage of directors fees, description             The 2003 Plan also provides for the issuance to each outside director a number of shares of the Company's Common Stock in lieu of 65% or 100% (based on option elected by each director) of the fee payable to the eligible director for services rendered as a member of the Board. The number of shares issued is determined at 75% of the market value as defined in the plan (the Company recognizes 100% of the market value of the shares issued).          
Number of additional common shares authorized         300,000              
Number of shares available for issuance             329,417       1,100,000  
2003 Outside Directors Stock Plan [Member] | Re-election [Member]                        
Options granted to purchase shares             2,400          
2003 Outside Directors Stock Plan [Member] | Maximum [Member] | Election [Member]                        
Options granted to purchase shares             6,000          
2010 Stock Option Plan [Member]                        
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term             10 years          
Fair market value of shares, granted description             The term of each stock option granted is to be fixed by the Compensation Committee, but no stock option is exercisable more than ten years after the grant date, or in the case of an incentive stock option granted to a 10% stockholder, five years after the grant date.          
Fair market value of shares, granted percentage             0.10          
Shares remaining available for issuance             140,000          
2010 Stock Option Plan [Member] | Common Stock [Member]                        
Stock options, expiration date             Jul. 10, 2020          
2010 Stock Option Plan [Member] | Common Stock One [Member]                        
Stock options, expiration date             May 15, 2022          
2010 Stock Option Plan [Member] | Ten Percent of Stockholder [Member]                        
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term             5 years          
2010 Stock Option Plan [Member] | Non-qualified Stock Options and Incentive Stock Options [Member] | Officers and Employees [Member]                        
Number of shares available for issuance             200,000          
2010 Stock Option Plan [Member] | Maximum [Member] | Common Stock [Member]                        
Options granted to purchase shares             10,000          
2010 Stock Option Plan [Member] | Maximum [Member] | Common Stock One [Member]                        
Options granted to purchase shares             50,000          
2010 Stock Option Plan [Member] | Maximum [Member] | Non-qualified Stock Options and Incentive Stock Options [Member] | Officers and Employees [Member]                        
Options granted to purchase shares             200,000          
2017 Stock Option Plan [Member]                        
Number of shares available for issuance             130,000 130,000        
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term             10 years          
Fair market value of shares, granted description             The term of each stock option granted under the 2017 Plan shall be fixed by the Compensation Committee, but no stock options will be exercisable more than ten years after the grant date, or in the case of an ISO granted to a 10% stockholder, five years after the grant date. The exercise price of any ISO granted under the 2017 Plan to an individual who is not a 10% stockholder at the time of the grant shall not be less than the fair market value of the shares at the time of the grant, and the exercise price of any incentive stock option granted to a 10% stockholder shall not be less than 110% of the fair market value at the time of grant.          
Fair market value of shares, granted percentage             1.10          
2017 Stock Option Plan [Member] | Ten Percent of Stockholder [Member]                        
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term             5 years          
2017 Stock Option Plan [Member] | Robert Ferguson [Member]                        
Common stock exercise price per share | $ / shares             $ 3.65          
2017 Stock Option Plan [Member] | Non-qualified Stock Options and Incentive Stock Options [Member]                        
Number of shares available for issuance             540,000          
2017 Stock Option Plan [Member] | Incentive Stock Options [Member]                        
Stock options granted vesting period         5 years              
Number of stock option shares granted         200,000              
Stock options, grants in period, exercise price | $ / shares         $ 3.65              
Stock options granted contractual term         6 years              
2017 Stock Option Plan [Member] | Incentive Stock Options [Member] | Employees [Member]                        
Stock options granted vesting period       5 years                
Number of stock option shares granted       110,000                
Stock options, grants in period, exercise price | $ / shares       $ 3.60                
Stock options granted contractual term       6 years                
2017 Stock Option Plan [Member] | Maximum [Member] | Robert Ferguson [Member]                        
Options granted to purchase shares             100,000          
2003 Outside Directors Stock Plan [Member] | Non-qualified Stock Options [Member] | New Director [Member]                        
Stock options granted vesting period     180 days     180 days            
Number of stock option shares granted     6,000     6,000            
Stock options, grants in period, exercise price | $ / shares     $ 4.05     $ 3.79            
Stock options granted contractual term     10 years     10 years            
2003 Outside Directors Stock Plan [Member] | Non-qualified Stock Options [Member] | Six Re-elected Directors [Member]                        
Stock options granted vesting period 180 days       180 days              
Number of stock option shares granted 12,000       12,000              
Stock options, grants in period, exercise price | $ / shares $ 4.30       $ 3.55              
Stock options granted contractual term 10 years       10 years              
2003 Outside Directors Stock Option Plan [Member]                        
Percentage of directors fees, description               As a member of the Board, each director elects to receive either 65% or 100% of the director's fee in shares of our Common Stock. The number of shares received is calculated based on 75% of the fair market value of our Common Stock determined on the business day immediately preceding the date that the quarterly fee is due.        
Stock issued during period for services, shares             60,598 61,598        
The 2003 Outside Directors Stock Plan [Member] | Portion of Director Fee Earned in Common Stock [Member]                        
Allocated share-based compensation expense | $             $ 249,000 $ 234,000        
[1] Options with exercise prices ranging from $2.79 to $13.35