Note 13 - Employee Benefit Plans - Changes in Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair value of plan assets at beginning of year	$ 9,482	$ 10,159
Actual return on plan assets	1,534	(479)
Employer contribution		500
Benefits paid	(417)	(698)
Benefit obligation at beginning of year	10,628	11,801
Interest cost	443	423
Actuarial (gain) loss	(22)	85
Effect of change in assumptions	1,672	(983)
Benefit obligation at end of year	12,304	10,628
Funded status (plan assets less benefit obligation)	(1,705)	(1,146)
Amounts recognized in accumulated other comprehensive loss consists of:
Accumulated net actuarial loss	6,616	6,126
Accumulated prior service benefit
Amount recognized, end of year	$ 6,616	$ 6,126