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Note 7 - Fair Value Measurement (Details) - Fair Value of Financial Assets and Liabililties Measure on Non-recurring Basis - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets:        
Impaired loans, net of valuation allowance $ 107 $ 110    
Loans held for sale 289 1,643    
Other real estate owned 5,686 5,237 $ 6,917 $ 6,986
Fair Value, Inputs, Level 2 [Member]        
Assets:        
Loans held for sale 289 1,643    
Other real estate owned 1,773 1,300    
Fair Value, Inputs, Level 3 [Member]        
Assets:        
Impaired loans, net of valuation allowance 107 110    
Other real estate owned $ 3,913 $ 3,937