Pension Plan (Details) - Components of net periodic pension cost - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Plan (Details) - Components of net periodic pension cost [Line Items]
Interest cost	$ 97,000	$ 125,000
Expected return on plan assets	(203,000)	(172,000)
Amortization of net actuarial loss	70,000	65,000
Net periodic pension (benefit) expense	$ (36,000)	$ 18,000