Property, Plant and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment
Gross property, plant, and equipment	$ 177,032,000	$ 189,412,000
Less: accumulated depreciation and amortization, including accumulated amortization of finance leases	(101,033,000)	(104,068,000)
Property, plant, and equipment - net	75,999,000	85,344,000
Depreciation	9,949,000	8,635,000
Impairments of property, plant, and equipment	0	0
Land
Property, Plant and Equipment
Gross property, plant, and equipment	5,869,000	5,284,000
Improvements to land and leaseholds
Property, Plant and Equipment
Gross property, plant, and equipment	19,404,000	19,956,000
Buildings
Property, Plant and Equipment
Gross property, plant, and equipment	31,447,000	34,814,000
Machinery and equipment, including equipment under finance leases
Property, Plant and Equipment
Gross property, plant, and equipment	118,190,000	123,806,000
Construction in progress
Property, Plant and Equipment
Gross property, plant, and equipment	$ 2,122,000	$ 5,552,000