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Note 2 - Investment Securities (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions   0   0   75
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   1.00%   1.00%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total       $ 0    
Debt Securities, Available-for-sale, Realized Loss     $ 0   $ 86,000  
Debt Securities, Time Deposits, Realized Loss   $ 0 0 0 11,000  
Debt Securities, Available-for-sale, Realized Gain   0        
Investment, Number of Shares Acquired (in shares) | shares 90,000          
Investment Ownership Percentage 5.00%          
Payments to Acquire Other Investments $ 1,900,000          
Equity Securities, FV-NI, Unrealized Gain   223,000     $ 117,000  
Equity Securities, FV-NI, Unrealized Loss     $ 14,000 171,000    
Equity Securities, FV-NI   $ 1,600,000   $ 1,600,000   $ 1,700,000