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Note 10 - Share Based Payments (Details Textual) - USD ($)
$ / shares in Units, xbrli-pure in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2007
Share-based Payment Arrangement, Expense   $ 358,000 $ 241,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 435,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 36 days    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total   250,000 250,000  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 0.80 $ 0.49  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.80 $ 0.47  
Fair Value of Restricted Stock   $ 489,000 $ 405,000  
Plain Vanilla Approach [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   10 years    
The 2006 Omnibus Incentive Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,752,708    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Estimated Forfeiture Rate   0.00% 0.00%  
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   2 years    
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years