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Note 4 - Accounting Policy (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Allowance for Loan Losses, Look-back Period 12    
Cumulative Effect of New Accounting Principle in Period of Adoption    
Accounting Standards Update 2016-01 [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption $ 56 $ 56  
Accounting Standards Update 2018-02 [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 633