Note 18 - Financial Instruments with Off-balance-sheet Risk - Financial Instruments With Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments to extend credit	$ 122,394	$ 145,065
Unused Line of Credit [Member]
Commitments to extend credit	61,622	71,101
Undisbursed Construction Loans [Member]
Commitments to extend credit	25,232	25,367
Home Equity Lines of Credit [Member]
Commitments to extend credit	19,240	20,032
Future Loan Commitments [Member]
Commitments to extend credit	15,696	27,822
Financial Standy Letter of Credit [Member]
Commitments to extend credit	$ 604	$ 743