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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   0.60%   0.60%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total       $ 0    
Debt Securities, Available-for-sale, Realized Gain   $ 0 $ 22,000 0 $ 22,000  
Debt Securities, Available-for-sale, Realized Loss   0 55,000 0 141,000  
Debt Securities, Time Deposits, Realized Loss   0 2,000 0 13,000  
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, Unrealized Gain   45,000     $ 108,000  
Equity Securities, FV-NI, Unrealized Loss     $ 9,000 126,000    
Equity Securities, FV-NI   $ 1,600,000   $ 1,600,000   $ 1,700,000