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Note 11 - Equity Incentive Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Dec. 22, 2023
Jun. 14, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 13, 2023
Jun. 13, 2017
Premium-Priced Employee Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Premium Priced Options, Exercise Price as Percentage of Market Price     110.00%      
Share-Based Payment Arrangement, Option [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 8.7      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 2 months 12 days      
Restricted Stock Units (RSUs) [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 8.0      
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, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 26.68 $ 26.93    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 9.3 $ 6.6    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Unsettled, Number     400,760      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding     $ 0.9      
Restricted Stock Units (RSUs) [Member] | Minimum [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years      
The 2017 Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)   435,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)   5,285,000     4,850,000  
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs (in shares)           2
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     700,000     4.6
The 2021 Inducement Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     0.1      
Common Stock, Capital Shares Reserved for Future Issuance, Number of Shares Increased 100,000          
Common Stock, Capital Shares Reserved for Future Issuance 350,000          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years