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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 23, 2017
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Payment Arrangement, Expense   $ 1.1 $ 1.2 $ 2.1 $ 2.4
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)       33,604 32,068
Performance Shares [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 2.7   $ 2.7  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected toVested (in shares)   181,847   181,847  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected to Vest, Performance Obligations Exceeded (in shares)   302,196   302,196  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       53,041  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       28,971  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)       24,070 48,140
Restricted Stock [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 1.4   $ 1.4  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 3 months 18 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       76,643  
Restricted Stock Units (RSUs) [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 2.0   $ 2.0  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 7 months 6 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       73,013  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       39,409  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)       33,604  
The 2017 Equity Compensation Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 1,200,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   338,684   338,684  
The 2017 Equity Compensation Plan [Member] | Restricted Stock, Options and Restricted Stock Units [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years        
The 2017 Equity Compensation Plan [Member] | Restricted Stock, Options and Restricted Stock Units [Member] | Vesting Each Year [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 33.33%        
The 2017 Equity Compensation Plan [Member] | Performance Shares [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years