Note 13 - Employee Benefit Plans - Changes in Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair value of plan assets at beginning of year	$ 10,599	$ 9,482
Actual return on plan assets	1,156	1,534
Employer contribution
Benefits paid	(439)	(417)
Benefit obligation at beginning of year	12,304	10,628
Interest cost	395	443
Actuarial (gain) loss	(29)	(22)
Effect of change in assumptions	1,357	1,672
Benefits paid	(439)	(417)
Benefit obligation at end of year	13,588	12,304
Funded status (plan assets less benefit obligation)	(2,272)	(1,705)
Amounts recognized in accumulated other comprehensive loss consists of:
Accumulated net actuarial loss	7,220	6,616
Accumulated prior service benefit
Amount recognized, end of year	$ 7,220	$ 6,616