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Note 6 - Other Real Estate Owned ("OREO") (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Acquired Through Foreclosure $ 851,000 $ 0  
Real Estate Owned, Transfer to Real Estate Owned 840,000
Gain Recognized on Other Real Estate at Repossession 11,000 $ (4,000)
Foreclosed Real Estate Expense $ 10,000