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Note 2 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Sep. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   1.00%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total   $ 0    
Debt Securities, Available-for-sale, Realized Loss   394,000 $ 86,000  
Debt Securities, Time Deposits, Realized Loss   0 11,000  
Debt Securities, Available-for-sale, Realized Gain   0 $ 131,000  
Investment, Number of Shares Acquired (in shares) 90,000      
Investment Ownership Percentage 5.00%      
Payments to Acquire Other Investments $ 1,900,000      
Equity Securities, FV-NI   $ 1,400,000   $ 1,700,000