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Note 7 - Fair Value Measurement - Fair Value of Financial Assets and Liabililties Measure on Non-recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]        
Impaired loans, net of valuation allowance    
Loans held for sale 915 1,643    
Other Real Estate Owned 448 1,300    
Fair Value, Inputs, Level 2 [Member]        
Impaired loans, net of valuation allowance 105 110    
Loans held for sale    
Other Real Estate Owned 3,889 3,937    
Impaired loans, net of valuation allowance 105 110    
Loans held for sale 915 1,643    
Other Real Estate Owned $ 4,337 $ 5,237 $ 6,872 $ 6,986