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Note 5 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Estimated Selling Costs of Impaired Loans $ 1,032,000 $ 843,000
Mandatorily Redeemable Securities $ 8,000,000  
Notes Payable, Other Payables [Member]    
Debt Instrument, Basis Spread on Variable Rate 1.67%  
Other Borrowings [Member]    
Notes Payable, Total $ 8,200,000