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Note 14 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
May 09, 2019
Dec. 31, 2019
Dec. 31, 2018
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total   $ 0 $ 0
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 500 $ 1,200
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   229,500 533,177
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total   $ 900 $ 1,300
Share-based Payment Arrangement, Expense   1,000 700
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 700  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   2 years 36 days  
Restricted Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year  
Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years  
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Expense   $ 700 $ 600
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years  
The Fourth Amended 2014 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Extension 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,791,565  
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   65,771