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Note 11 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Loans Receivable, Fair Value Disclosure $ 15,003,000   $ 15,088,000
Financing Receivable, before Allowance for Credit Loss 2,446,858,000   2,433,015,000
Residential Mortgage [Member]      
Loans Receivable, Fair Value Disclosure 15,000,000   15,100,000
Increase (Decrease) in Finance Receivables 2,000 $ 577,000  
Residential Mortgage [Member] | Fair Value, Inputs, Level 2 [Member]      
Loans Receivable, Fair Value Disclosure 15,000,000   15,100,000
Financing Receivable, before Allowance for Credit Loss 16,200,000   $ 16,300,000
Increase (Decrease) in Finance Receivables $ 2,000 $ 577,000