Note 13 - Employee Benefit Plans - Changes in Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair value of plan assets at beginning of year	$ 11,316	$ 10,599
Actual return on plan assets	913	1,156
Employer contribution	0	0
Benefits paid	(441)	(439)
Benefit obligation at beginning of year	13,588	12,304
Interest cost	338	395
Actuarial loss	(22)	(29)
Effect of change in assumptions	(294)	1,357
Benefits paid	(441)	(439)
Benefit obligation at end of year	13,169	13,588
Funded status (plan assets less benefit obligation)	(1,381)	(2,272)
Accumulated net actuarial loss	6,418	7,220
Accumulated prior service benefit	0	0
Amount recognized, end of year	$ 6,418	$ 7,220