Pension Plan (Details) - Components of net periodic pension cost - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Plan (Details) - Components of net periodic pension cost [Line Items]
Interest cost	$ 96,000	$ 125,000	$ 289,000	$ 376,000
Expected return on plan assets	(203,000)	(172,000)	(610,000)	(517,000)
Amortization of net actuarial loss	70,000	65,000	211,000	196,000
Net periodic pension (benefit) expense	$ (37,000)	$ 18,000	$ (110,000)	$ 55,000