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Note 10 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Long-term Federal Home Loan Bank Advances $ 10.0 $ 15.0
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 26.0 28.0
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds $ 159.3 $ 155.0