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Note 2 - Investment Securities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value, Total     $ 0
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage 3.20%    
Proceeds from Sale of Debt Securities, Available-for-sale   $ 0  
Municipal Notes [Member]      
Debt Securities, Available-for-sale, Realized Gain $ 7,000    
U.S Government Agency Mortgage-backed CMO [Member]      
Debt Securities, Available-for-sale, Realized Loss $ 6,000