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Note 7 - Deposits - Interest Expense on Deposits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NOW, Interest expense $ 7 $ 8 $ 5
NOW, Weighted Avg. Effective Interest Rate 0.0272% 0.0293% 0.0182%
Savings, Interest expense $ 1,160 $ 778 $ 489
Savings, Weighted Avg. Effective Interest Rate 0.8069% 0.6196% 0.4929%
Money market, Interest expense $ 5 $ 7 $ 9
Money market, Weighted Avg. Effective Interest Rate 0.0367% 0.0365% 0.0389%
Certificates of deposit, less than $250,000, Interest expense $ 1,875 $ 888 $ 1,150
Certificates of deposit, less than $250,000, Weighted Avg. Effective Interest Rate 1.0499% 0.646% 0.7111%
Certificates of deposit, $250,000 or greater, Interest expense $ 912 $ 215 $ 147
Certificates of deposit, $250,000 or greater, Weighted Avg. Effective Interest Rate 1.4577% 0.9722% 0.8456%
Brokered deposits, Interest expense $ 989 $ 346 $ 216
Brokered deposits, Weighted Avg. Effective Interest Rate 1.2417% 0.2579% 0.193%
Interest Expense on Deposits, Total, Interest expense $ 4,948 $ 2,242 $ 2,016
Interest Expense on Deposits, Total, Weighted Avg. Effective Interest Rate 0.9878% 0.5533% 0.5477%