Note 16 - Company Only Condensed Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Other expense	$ 9,774	$ 9,787	$ 9,249	$ 9,628	$ 9,562	$ 9,509	$ 9,472	$ 10,098	$ 38,438	$ 38,641
Income before income tax and undistributed subsidiary excess distributions	3,634	2,661	3,197	3,268	4,624	5,341	1,100	4,832	12,760	15,897
Income tax expense	$ 1,189	$ 713	$ 845	$ 850	$ 1,234	$ 1,417	$ 293	$ 1,281	3,597	4,225
Parent Company [Member]
Dividends from subsidiary									13,713	21,200
Other expense									1,625	1,600
Income before income tax and undistributed subsidiary excess distributions									12,088	19,600
Income tax expense									(231)	(433)
Income before equity in undistributed subsidiary excess distributions									12,319	20,033
Equity in undistributed subsidiary excess distributions									(3,156)	(8,361)
Net income									$ 9,163	$ 11,672