Note 22 - Parent Company-only Financial Statements - Condensed Balance Sheets (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noninterest bearing deposits and cash	$ 3,006,000	$ 2,693,000
Other assets	9,387,000	9,526,000
Total assets	880,729,000	979,836,000
Borrowings	120,813,000	130,900,000
Shareholders' equity	63,219,000	66,994,000	$ 69,340,000	$ 66,749,000
Total liabilities and shareholders' equity	880,729,000	979,836,000
Parent Company [Member]
Noninterest bearing deposits and cash	548,000	667,000
Investment in subsidiary	91,836,000	96,235,000
Other assets	1,104,000	564,000
Total assets	93,488,000	97,466,000
Borrowings	29,819,000	29,707,000
Accrued expenses and other liabilities	450,000	765,000
Shareholders' equity	63,219,000	66,994,000
Total liabilities and shareholders' equity	$ 93,488,000	$ 97,466,000