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Note 22 - Qualified Affordable Housing Project Investment (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Tax Credits and Other Tax Benefits $ 497,000 $ 393,000
Income Tax Expense (Benefit) [Member]    
Investment Amortization 361,000 329,000
Other Assets [Member]    
Investments, Total 3,200,000 3,600,000
Other Liabilities [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 1,900,000 $ 2,900,000