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Note 10 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Loans Receivable, Fair Value Disclosure $ 13,868,000   $ 13,868,000   $ 15,088,000
Financing Receivable, before Allowance for Credit Loss 2,488,422,000   2,488,422,000   2,433,015,000
Residential Mortgage [Member]          
Loans Receivable, Fair Value Disclosure 13,900,000 $ 14,300,000 13,900,000 $ 14,300,000  
Increase (Decrease) in Finance Receivables 184,000 (520,000) 186,000 57,000  
Residential Mortgage [Member] | Fair Value, Inputs, Level 2 [Member]          
Loans Receivable, Fair Value Disclosure 13,900,000   13,900,000   15,100,000
Financing Receivable, before Allowance for Credit Loss 14,600,000   14,600,000   $ 16,300,000
Increase (Decrease) in Finance Receivables $ 184,000 $ (520,000) $ 186,000 $ 57,000