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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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, Grants in Period (in shares) 3,007   209,636 146,007  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)   220      
Share-Based Payment Arrangement, Expensed and Capitalized, Amount $ 100 $ 0 $ 6,500 $ 3,600  
Share-Based Payment Arrangement, Expense 1,000 800 1,900 1,500  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount 8,500   $ 8,500    
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 $ 100 $ 200 $ 100 $ 400  
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) 44,652   44,652    
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) 1,945,463   1,945,463