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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 23, 2017
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   0   0   0
Share-Based Payment Arrangement, Expense   $ 1.2 $ 1.1 $ 2.5 $ 2.1  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   2.1   $ 2.1    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 8 months 12 days    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)         33,604  
Performance Shares [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 2.9   $ 2.9    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 1 month 6 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected toVested (in shares)   235,767   235,767    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected to Vest, Performance Obligations Exceeded (in shares)   383,079   383,079    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       43,331    
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       23,754    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)       19,577 24,070  
Restricted Stock [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 1.7   $ 1.7    
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)       70,942    
Restricted Stock Units (RSUs) [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       83,489    
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       44,806    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)       38,683    
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)   168,971   168,971    
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