Note 18 - Financial Instruments with Off-balance Sheet Risk - Financial Instruments With Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments to extend credit	$ 145,065	$ 179,727
Unused Line of Credit [Member]
Commitments to extend credit	71,101	77,120
Undisbursed Construction Loans [Member]
Commitments to extend credit	25,367	20,679
Home Equity Lines of Credit [Member]
Commitments to extend credit	20,032	19,330
Future Loan Commitments [Member]
Commitments to extend credit	27,822	61,438
Financial Standy Letter of Credit [Member]
Commitments to extend credit	$ 743	$ 1,160