Note 16 - Commitments and Contingencies - Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fixed rate	$ 4,946	$ 933
Adjustable rate	930	8,245
Commitments to extend credit	114,428	117,900
Standby Letters of Credit [Member]
Commitments to extend credit	1,295	1,246
Unused Lines of Credit On Credit Cards [Member]
Commitments to extend credit	6,641	5,660
Undisbursed Commercial and Personal Lines of Credit [Member]
Commitments to extend credit	26,862	32,302
Undisbursed Portion of Construction Loans in Process [Member]
Commitments to extend credit	26,675	25,020
Undisbursed Portion of Home Equity Lines of Credit [Member]
Commitments to extend credit	$ 47,079	$ 44,494