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Note 12 - Stock Options and Restricted Stock (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jan. 01, 2016
Jul. 27, 2010
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jul. 18, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     1,946,833   1,946,833   2,544,665  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         0 1,230,002    
Stock Issued During Period, Shares, New Issues           663,938    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 7,000   $ 7,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition         244 days      
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance     2,034,666   2,034,666   836,667  
Selling, General and Administrative Expenses [Member]                
Share-based Payment Arrangement, Expense     $ 3,000 $ 54,000 $ 74,000 $ 188,000    
Selling, General and Administrative Expenses [Member] | Restricted Stock [Member]                
Share-based Payment Arrangement, Expense     $ 50,000   $ 147,000      
Option Plan 2010 Member                
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum   15.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 5,719,069   0   0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 38,127,129   474,666   474,666      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               2,391,711
Option Plan 2010 Member | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year              
Option Plan 2010 Member | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years              
The 2016 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant               10,391,711
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     1,472,167   1,472,167      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               8,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance     2,034,666   2,034,666