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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total   $ 0        
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       53,584 61,373  
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total       $ 1,700 $ 600  
Share-based Payment Arrangement, Expense       900 700  
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   1,300   $ 1,300    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 6 months    
Restricted Stock [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)       12 months    
Restricted Stock [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)       60 months    
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense   700 $ 100 $ 1,400 300  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)       3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)       5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       80.90%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       0.86%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value   2,100   $ 3,200 $ 0  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 3,100   $ 3,100   $ 1,400
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)   1,613,958   1,613,958    
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   54,734   54,734