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Note 9 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Loans Receivable, Fair Value Disclosure $ 12,571,000   $ 12,571,000   $ 12,728,000
Residential Mortgage [Member] | Fair Value, Inputs, Level 2 [Member]          
Loans Receivable, Fair Value Disclosure 12,600,000   12,600,000   12,700,000
Financing Receivable, before Allowance for Credit Loss 13,200,000   13,200,000   $ 13,800,000
Increase (Decrease) in Finance Receivables $ 203,000 $ 262,000 $ 469,000 $ 448,000