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Note 5 - Qualified Affordable Housing Project Investment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Amortization Method Qualified Affordable Housing Project Investments, Amortization $ 82,000 $ 89,000 $ 252,000 $ 266,000  
Affordable Housing Tax Credits and Other Tax Benefits, Amount 100,000 $ 105,000 308,000 $ 314,000  
Other Assets [Member]          
Investments 1,900,000   1,900,000   $ 2,200,000
Other Liabilities [Member]          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 168,000   $ 168,000   $ 216,000