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Note 5 - Stock-based Compensation (Details Textual) - The 2018 Incentive Compensation Plan [Member] - $ / shares
1 Months Ended 6 Months Ended
May 01, 2023
Mar. 31, 2023
Jun. 30, 2023
Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 11,852 174,422  
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)   $ 79.9 $ 82.9
Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   1 year  
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   4 years  
Performance Stock Units (PSU) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   35,081  
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)   $ 79.6  
Performance Stock Units (PSU) [Member] | Minimum [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   1 year