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Note 8 - Borrowings - Components of Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Securities sold under agreements to repurchase $ 30,151   $ 30,086 [1]
FHLB advances   $ 50,000  
Total borrowings 30,151   80,086
Federal Home Loan Bank Borrowings [Member] | Long-term Advances [Member]      
FHLB advances   $ 50,000
FHLB advances   4.00%
Retail Repurchase Agreements [Member]      
Securities sold under agreements to repurchase $ 5,151   $ 5,086
Weighted average rate 0.10%   0.07%
Wholesale Repurchase Agreements [Member]      
Securities sold under agreements to repurchase $ 25,000   $ 25,000
Weighted average rate 3.18%   3.18%
[1] Derived from audited financial statements