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Note 10 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Loans Receivable, Fair Value Disclosure $ 13,861,000   $ 13,861,000   $ 15,088,000
Residential Mortgage [Member]          
Loans Receivable, Fair Value Disclosure 13,900,000 $ 15,200,000 13,900,000 $ 15,200,000  
Increase (Decrease) in Finance Receivables 262,000 (343,000) 448,000 (285,000)  
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 $ 262,000 $ (343,000) $ 448,000 $ (285,000)