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Note 10 - Financial Instrument Commitments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commitments to Extend Credit [Member]    
Commitments to extend credit and unused lines of credit $ 274,378 $ 232,492
Standby Letters of Credit [Member]    
Commitments to extend credit and unused lines of credit 11,954 9,493
Commitments to extend credit and unused lines of credit $ 286,332 $ 241,985