Annual report pursuant to Section 13 and 15(d)

Note 6 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details Textual)

v3.6.0.2
Note 6 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details Textual) - USD ($)
 12 Months Ended
Aug. 02, 2016
Jul. 28, 2016
May 15, 2016
Sep. 17, 2015
Apr. 28, 2010
Jul. 29, 2003
Dec. 31, 2016
Dec. 31, 2015
Aug. 02, 2013
May 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term [1]             3 years 255 days 4 years 182 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period               3,423    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price             $ 4.09 $ 4.19    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit             2.79      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit             $ 14.75      
Allocated Share-based Compensation Expense             $ 98,000 $ 92,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant             247,200      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures             62,000 12,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             62,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized             $ 74,000      
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost not yet Recognized in Year Two             43,000      
Employee Service Share-based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized in Year Three             30,000      
Employee Service Share-based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized In Year Four             $ 1,000      
Warrant [Member]                    
Class of Warrant or Right, Outstanding             0      
Robert Freguson and William Lampson Lenders [Member] | Warrant [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 70,000                  
Class of Warrant or Right, Exercised During Period 2                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.23                  
Due to Related Parties                 $ 3,000,000  
Employee Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [2]     6 years              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period             0 0    
Allocated Share-based Compensation Expense             $ 53,000 $ 53,000    
Employee Stock Option [Member] | Contractual Term with One-third Yearly Vesting [Member]                    
Share-based Compensation Maximum Contractual Term             6 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years      
Director Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [2]   10 years   10 years            
Allocated Share-based Compensation Expense             $ 45,000 $ 39,000    
Share-based Compensation Maximum Contractual Term             10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             180 days      
The 2003 Outside Directors Stock Plan [Member]                    
Percentage of Fair Market Value of Common Stock to Determine Number of Shares to Directors           75.00% 75.00%      
Stock Issued During Period, Shares, Share-based Compensation, Gross             55,793 71,324    
The 2003 Outside Directors Stock Plan [Member] | Portion of Director Fees Earned in Common Stock [Member]                    
Allocated Share-based Compensation Expense             $ 233,000 $ 269,000    
The 2003 Outside Directors Stock Plan [Member] | Minimum [Member]                    
Share-base Compensation Arrangement by Share-based Payment Award Percentage of Stock in Lieu of Fee Payable           65.00% 65.00%      
The 2003 Outside Directors Stock Plan [Member] | Maximum [Member]                    
Share-base Compensation Arrangement by Share-based Payment Award Percentage of Stock in Lieu of Fee Payable           100.00% 100.00%      
The 2003 Outside Directors Stock Plan [Member] | Employee Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term           180 days        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years        
The 2003 Outside Directors Stock Plan [Member] | Non-qualified Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years                
Stock Issued During Period, Shares, Share-based Compensation, Gross               3,423    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period               3,423    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 4.60           $ 2.79    
Proceeds from Stock Options Exercised               $ 10,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   180 days                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   12,000                
Third Amendment to 2003 Outside Directors Stock Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           800,000        
Third Amendment to 2003 Outside Directors Stock Plan [Member] | Reduced to [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award Number of Options Granted Upon Initial Election to Board           6,000        
Share-based Compensation Arrangement by Share-based Payment Award Number of Options Granted Upon Re-electionto Board           2,400        
The 2010 Stock Option Plan [Member]                    
Percentage of Fair Market Value of Common Stock to Determine Number of Shares to Directors         110.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         200,000          
The 2010 Stock Option Plan [Member] | Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     6 years              
Share-based Compensation Arrangement by Share-based Payment Award Stockholder Percentage         10.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term         5 years          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 3.97              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years              
The 2010 Stock Option Plan [Member] | Incentive Stock Options [Member] | Executive Vice President [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     50,000              
Rights Plan [Member]                    
Common Stock Ownership Percentage Trigger for Share Rights                   20.00%
Share Multiplier for Common Stockholders not Part of Non-board Approved Shareholders                   2
Acquired Percentage of the Company that Triggers Share Rights                   50.00%
Purchase Price Multiplier for Common Stockholder When Acquired Percentage is Triggered                   2
Purchase Price of Rights                   $ 13
Purchase Price for Repurchase of Rights                   $ 0.001
[1] Options with exercise prices ranging from $2.79 to $14.75
[2] The expected option life is based on historical exercises and post-vesting data.