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Note 2 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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 3.60% 3.60%   3.60%    
Proceeds from Sale of Debt Securities, Available-for-sale   $ 0        
Investment, Number of Shares Acquired 90,000          
Investment Ownership Percentage 5.00% 5.00%   5.00%    
Payments to Acquire Other Investments       $ 1,922,000  
Other Assets [Member]            
Payments to Acquire Other Investments $ 1,900,000          
Municipal Notes [Member]            
Debt Securities, Available-for-sale, Realized Gain       218,000    
Debt Securities, Available-for-sale, Realized Loss     $ 7,000 307,000 7,000  
U.S Government Agency Mortgage-backed CMO [Member]            
Debt Securities, Available-for-sale, Realized Gain     $ 58,000   $ 3,000  
Debt Securities, Available-for-sale, Realized Loss       $ 6,000