Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Subsequent Events (Details Textual)

v3.7.0.1
Note 13 - Subsequent Events (Details Textual) - USD ($)
6 Months Ended
Jul. 27, 2017
May 15, 2016
Jun. 30, 2017
Jun. 30, 2016
Jan. 27, 2021
Jan. 27, 2019
Jan. 27, 2018
Jul. 26, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     223,200 [1] 268,000 [1]         247,200 218,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 3.79 $ 3.79            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     6,000 50,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number [1]     180,534 181,533            
Consultant [Member]                    
Monthly Consulting Fees     $ 4,000              
The 2017 Stock Option Plan [Member] | Ferguson Stock Option [Member] | Scenario, Forecast [Member] | Vesting for Treatment and Disposal of Three Gallons of Waste by January 27, 2018 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number             10,000      
The 2017 Stock Option Plan [Member] | Ferguson Stock Option [Member] | Scenario, Forecast [Member] | Vesting for Treatment and Disposal of 2,000 Gallons of Waste by January 27, 2019 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number           30,000        
The 2017 Stock Option Plan [Member] | Ferguson Stock Option [Member] | Scenario, Forecast [Member] | Vesting for Treatment and Disposal of 50,000 Gallons of Waste by January 27, 2021 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number         60,000          
The 2017 Stock Option Plan [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 540,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Rollover Options 140,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years                  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 3.65                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 6 years                  
Percentage of Fair Market Value of Common Stock to Determine Number of Shares to Directors 110.00%                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] | The 10 percent of Stockholder [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] | Chief Executive Officer [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 50,000                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] | Executive Vice President/Chief Operating Officer [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 100,000                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Employee Stock Option [Member] | Chief Financial Officer [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 50,000                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Ferguson Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years                  
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Ferguson Stock Option [Member] | Consultant [Member]                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 3.65                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 100,000                  
The 2010 Stock Option Plan [Member] | Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 3.97                
The 2010 Stock Option Plan [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 60,000                  
The 2003 Outside Directors Stock Plan [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant               99,900    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 300,000                  
[1] The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.