Net Periodic Benefit Cost-Defined Benefit Plans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net periodic benefit cost of the domestic non-contributory defined benefit plan
Interest cost	$ 198,000	$ 138,000	$ 594,000	$ 414,000
Expected return on plan assets	(326,000)	(412,000)	(978,000)	(1,237,000)
Amortization of net loss	37,000	17,000	111,000	52,000
Net periodic benefit	$ (91,000)	$ (257,000)	(273,000)	$ (771,000)
Employer contributions made to the defined benefit plan			$ 0