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Note 13 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 09, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total   $ 0 $ 0 $ 0 $ 0  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   200   $ 200   $ 500
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       61,373 205,000  
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total       $ 600 $ 700  
Share-based Payment Arrangement, Expense       700 700  
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   700   $ 700    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 73 days    
Restricted Stock [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)       1 year    
Restricted Stock [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)       5 years    
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense   $ 100 $ 200 $ 300 $ 600  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years    
The Fourth Amended 2014 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 2,000,000          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Extension (Year) 2 years          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   1,735,594   1,735,594    
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   57,666   57,666