Note 13 - Employee Benefit Plans - Changes in Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair value of plan assets at beginning of year	$ 10,159	$ 9,331
Actual return on plan assets	(479)	1,218
Employer contribution	500
Benefits paid	(698)	(390)
Benefit obligation at beginning of year	11,801	10,609
Interest cost	423	438
Actuarial loss	85	71
Effect of change in assumptions	(983)	1,073
Benefit obligation at end of year	10,628	11,801
Funded status (plan assets less benefit obligation)	(1,146)	(1,642)
Amounts recognized in accumulated other comprehensive loss consists of:
Accumulated net actuarial loss	6,126	6,125
Accumulated prior service benefit
Amount recognized, end of year	$ 6,126	$ 6,125