Pension Plan (Details) - Components of net periodic pension cost - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plan (Details) - Components of net periodic pension cost [Line Items]
Interest cost	$ 387,000	$ 501,000
Expected return on plan assets	(786,000)	(682,000)
Amortization of net actuarial loss	288,000	264,000
Net periodic pension (benefit) cost	$ (111,000)	$ 83,000