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Note 4 - Qualified Affordable Housing Project Investment (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Investment Amortization $ 96,000 $ 82,000  
Tax Credits and Other Tax Benefits 111,000 $ 125,000  
Other Assets [Member]      
Investments, Total 3,100,000   $ 3,200,000
Other Liabilities [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 1,100,000   $ 1,900,000