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Note 7 - Other Real Estate Owned ("OREO") (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 10, 2018
Real Estate Acquired Through Foreclosure $ 2,945,000 $ 0    
Real Estate Owned, Transfer to Real Estate Owned 1,954,000 $ 840,000  
Net Gain (Loss) Recognized on Sale or Acquisition of Other Real Estate $ 9,000 $ (11,000)  
Prime Bank [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Real Estate Owned $ 991,000     $ 991,000