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Note 4 - Mortgage Servicing Rights (Details Textual) - Mortgage Servicing Rights [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Asset $ 1,630.0   $ 1,630.0
Servicing Asset at Fair Value, Amount 20.7   $ 21.0
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset $ 1.1 $ 1.4  
Minimum [Member]      
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 0.50%    
Maximum [Member]      
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.00%