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Note 3 - Investment Securities (Details Textual)
1 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Available-for-sale Securities Pledged as Collateral, Amortized Cost   $ 53,400,000    
Number of Holdings of Securities with an Aggregate Book Value Greater than 10% of Stockholders' Equity   0 0  
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   0.80%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total   $ 0    
Debt Securities, Available-for-sale, Realized Gain   22,000 $ 218,000 $ 61,000
Debt Securities, Available-for-sale, Realized Loss   156,000 313,000 7,000
Debt Securities, Time Deposits, Realized Loss   13,000    
Investment, Number of Shares Acquired | shares 90,000      
Investment Ownership Percentage 5.00%      
Payments to Acquire Other Investments $ 1,900,000 1,922,000
Equity Securities, FV-NI, Unrealized Gain   32,000    
Equity Securities, FV-NI, Unrealized Loss     207,000  
Equity Securities, FV-NI   1,700,000 $ 1,700,000  
Securities Available for Sale [Member]        
Debt Securities, Available-for-sale, Restricted   $ 53,300,000