Note 11 - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Provision For Income Taxes [Abstract]
Current Federal income taxes									$ 3,629	$ 2,569	$ 2,375
Current state income taxes									219	52	156
Deferred Federal income taxes (benefits)									21	(53)	207
Deferred state income taxes (benefits)									92	(6)	112
Net provision	$ 1,052	$ 685	$ 951	$ 1,273	$ 1,056	$ 914	$ 998	$ (406)	$ 3,961	$ 2,562	$ 2,850