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Note 5 - Shareholders' Equity (Details Textual) - $ / shares
3 Months Ended 9 Months Ended
Oct. 21, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Common Stock, Dividends, Per Share, Declared (in dollars per share)   $ 0.028 $ 0.028 $ 0.028 $ 0.025 $ 0.025 $ 0.025 $ 0.084 $ 0.075  
Restricted Stock Units (RSUs) [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               110,573 128,942  
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)               $ 27.8 $ 23.61  
Performance Based Restricted Stock Units (RSUs) [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               6,100 138,000 91,042
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)               5 years 5 years 5 years
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year One               10.00% 15.00% 15.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Two               15.00% 20.00% 20.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Three               20.00% 20.00% 20.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Four               25.00% 20.00% 20.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Five               30.00% 25.00% 25.00%
Performance Based Restricted Stock Units (RSUs) [Member] | Two Thousand Twenty Four Performance [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               610 27,600 18,211
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)               $ 28.79 $ 26.79 $ 26.79
Performance Based Restricted Stock Units (RSUs) [Member] | Not Based on 2023 or 2024 Performance [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               5,490 89,700  
Performance Based Restricted Stock Units (RSUs) [Member] | Not Based on 2022, 2023, or 2024 Performance [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                   40,967
Subsequent Event [Member]                    
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.028                  
Subsequent Event [Member] | O 2024 Q4 Dividends [Member]                    
Dividends Payable, Date to be Paid Nov. 15, 2024                  
Dividends Payable, Date of Record Nov. 04, 2024