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Note 2 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Sep. 30, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   1.70%    
Debt Securities, Available-for-sale, Realized Gain   $ 12,000    
Debt Securities, Available-for-sale, Realized Loss   5,000    
Proceeds from Sale of Debt Securities, Available-for-sale     $ 0  
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 Loss   234,000 $ 394,000  
Equity Securities, FV-NI   $ 1,800,000   $ 1,600,000