Note 6 - Other Borrowed Funds (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total	$ 35,700
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	2.34%
Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Total	$ 0
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	235,522
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	$ 145,822
Debt, Weighted Average Interest Rate	2.87%	2.77%
Notes Payable to Bank, Total	$ 3,323	$ 3,440
Director [Member]
Notes Payable, Related Parties	360	360
FHLB Line of Credit [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	80,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	80,000
Letters of Credit Outstanding, Amount	$ 54,000	60,000
Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	1.53%
Debt Instrument, Interest Rate, Stated Percentage	1.50%
Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	3.31%
Debt Instrument, Interest Rate, Stated Percentage	4.09%
Residential Real Estate [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 295,515
Commercial Loans [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	76,898
FHLB Stock [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	5,365
Federal Home Loan Bank Advances [Member]
Capital Lease Obligations, Total	$ 18	$ 29

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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