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Note 4 - Qualified Affordable Housing Project Investment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Amortization Method Qualified Affordable Housing Project Investments, Amortization $ 89,000 $ 67,000 $ 266,000 $ 249,000  
Affordable Housing Tax Credits and Other Tax Benefits, Amount 106,000 $ 129,000 317,000 $ 349,000  
Other Assets [Member]          
Investments, Total 2,600,000   2,600,000   $ 2,900,000
Other Liabilities [Member]          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 396,000   $ 396,000   $ 496,000