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Note 17 - Commitments and Contingencies - Commitments to Extend Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fixed rate $ 933 $ 4,542
Adjustable rate 8,245 10,661
Commitments to extend credit 117,900 106,563
Standby Letters of Credit [Member]    
Commitments to extend credit 1,246 1,245
Unused Lines of Credit On Credit Cards [Member]    
Commitments to extend credit 5,660 5,463
Undisbursed Commercial and Personal Lines of Credit [Member]    
Commitments to extend credit 32,302 32,125
Undisbursed Portion of Construction Loans in Process [Member]    
Commitments to extend credit 25,020 19,037
Undisbursed Portion of Home Equity Lines of Credit [Member]    
Commitments to extend credit $ 44,494 $ 33,490