5. Employee Benefit Plan (Tables)

3 Months Ended

Mar. 31, 2020

Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract]

Schedule of employee benefit plan

	Three Months Ended
	March 31, 2020			March 31, 2019
Service cost	$	202		$	185
Interest cost		105			137
Expected return on plan assets		(183	)		(202	)
Amortization of prior service cost		(3	)		(4	)
Amortization of net loss		55			70
Net periodic pension cost	$	176		$	186