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Note 8 - Borrowings - Components of Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities sold under agreements to repurchase $ 27,869 $ 30,086 [1]
Total borrowings 77,869 80,086
Federal Home Loan Bank Borrowings [Member] | Long-term Advances [Member]    
FHLB advances $ 50,000 $ 50,000
FHLB advances 4.00% 4.00%
Retail Repurchase Agreements [Member]    
Securities sold under agreements to repurchase $ 2,869 $ 5,086
Weighted average contractual rate 0.06% 0.07%
Wholesale Repurchase Agreements [Member]    
Securities sold under agreements to repurchase $ 25,000 $ 25,000
Weighted average contractual rate 3.18% 3.18%
[1] Derived from audited financial statements