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Note 7 - Investment Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Money Market Funds, at Carrying Value $ 34,979     $ 36,673
Equity Securities, FV-NI 1,575     935
Cumulative Effect of New Accounting Principle in Period of Adoption      
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (55) $ 0    
Proceeds from Sale of Equity Securities, FV-NI 0      
Collateral Pledged [Member]        
Debt Securities, Available-for-sale, Restricted 208,000     $ 214,000
Other Noninterest Income [Member]        
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (55)      
Accounting Standards Update 2016-01 [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption $ 56   $ 56