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Note 15 - Stock Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Oct. 15, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 329 $ 416  
Share-based Payment Arrangement, Expense, Tax Benefit   $ 68 $ 144  
Incentive and Non-Qualified Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   0 34,755 366,356
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested or Cancelled       267,413
Share-based Payment Arrangement, Amount Capitalized $ 0   $ 0  
Share-based Payment Arrangement, Expense   $ 167 290  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   48 216  
Restricted Stock Units (RSUs) [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years
Incentive Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 29,460      
Non-Qualified Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 20,540      
Incentive and Non-Qualified Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share-based Payment Arrangement, Expense   $ 87 $ 18  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross