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Note 4 - Mortgage Servicing Rights (Details Textual) - Mortgage Servicing Rights [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Asset $ 1,600.0   $ 1,600.0   $ 2,830.0
Servicing Asset at Fair Value, Amount 20.8   20.8   $ 38.2
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset $ 1.1 $ 1.8 $ 2.5 $ 3.6  
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%