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Note 4 - Qualified Affordable Housing Project Investment (Details Textual)
3 Months Ended
Mar. 31, 2018
USD ($)
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 98,000
Income Tax Expense (Benefit) [Member]  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 82,000
Other Assets [Member]  
Amortization Method Qualified Affordable Housing Project Investments 3,900,000
Other Liabilities [Member]  
Qualified Affordable Housing Project Investments, Commitment $ 3,500,000