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Note 13 - Employee Equity Incentive Plans (Details Textual) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   1,225,000 2,002,500 3,130,000
Proceeds from Stock Options Exercised   $ 129,500 $ 27,250  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.19 $ 0.24  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 76,846    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   2 years 138 days    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 0 $ 0  
The 2016 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   10,000,000    
Common Stock Available for Issuance Increasing Period   9 years    
Common Stock Available for Issuance, Annual Increase Percent   5.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   450,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   9,550,000    
The 2016 Plan [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   1 year    
The 2016 Plan [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   2 years    
The 2016 Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement, Installments for Vesting   2    
The 2016 Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number   0    
The 2016 Plan [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years    
Equity Incentive Plan 2009 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   7,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years    
Share-based Compensation Arrangement, Installments for Vesting   2    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   775,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   0    
Equity Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   1 year    
Equity Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   2 years    
Equity Incentive Plan 2009 [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number   3,893,330    
Equity Incentive Plan 2009 [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years