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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Share-based Compensation, Tax Charges to Additional Paid in Capital From Exercise and Vesting $ 0 $ 0 $ 0 $ 0  
Restricted Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) 583 840      
Share-Based Payment Arrangement, Expensed and Capitalized, Amount   $ 0 $ 6,500 $ 3,600  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     209,053 145,167  
Share-Based Payment Arrangement, Expense $ 1,000 800 $ 2,800 $ 2,300  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount 7,500   $ 7,500    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 6 months    
Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)     12 months    
Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)     60 months    
Share-Based Payment Arrangement, Option [Member]          
Share-Based Payment Arrangement, Expense $ 0 $ 100 $ 100 $ 600  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     0 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) 0 0 0 0  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 0   $ 0   $ 100
Employee Stock Purchase Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 500,000   500,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 43,361   43,361    
The Fourth Amended 2014 Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 5,750,000   5,750,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 1,947,592   1,947,592