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Note 14 - Stock Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Oct. 15, 2018
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 416  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 144 $ 52
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   34,755 366,356
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested or Cancelled     267,413
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 0 $ 0  
Allocated Share-based Compensation Expense, Total   290 $ 308
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 216 $ 343
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    
Allocated Share-based Compensation Expense, Total   $ 18  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   50,000