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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   0.90%   0.90%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total       $ 0    
Debt Securities, Available-for-sale, Realized Gain   $ 22,000 $ 0 22,000 $ 218,000  
Debt Securities, Available-for-sale, Realized Loss   55,000 $ 0 141,000 $ 313,000  
Debt Securities, Time Deposits, Realized Loss   2,000   13,000    
Investment, Number of Shares Acquired 90,000          
Investment Ownership Percentage 5.00%   5.00%   5.00%  
Payments to Acquire Other Investments $ 1,900,000     $ 1,922,000  
Equity Securities, FV-NI, Unrealized Loss   9,000        
Equity Securities, FV-NI, Unrealized Gain       108,000    
Equity Securities, FV-NI   $ 1,800,000   $ 1,800,000   $ 1,700,000