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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended
May 23, 2017
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   0   0
Share-Based Payment Arrangement, Expense   $ 1.3 $ 1.0  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   38,683 33,604  
Performance Shares [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 3.4    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 3 months 18 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected toVested (in shares)   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    
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   $ 1.4    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 4 months 24 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   38,752    
Restricted Stock Units (RSUs) [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 2.6    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 9 months 18 days    
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)   236,926    
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