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Note 8 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Long-term Federal Home Loan Bank Advances, Total $ 10.0 $ 10.0
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 21.5 26.0
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds $ 168.1 $ 159.3