Property, Plant and Equipment (Details) - USD ($)		12 Months Ended
	Sep. 24, 2021	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Gross property, plant, and equipment		$ 162,061,000	$ 168,638,000
Less: accumulated depreciation and amortization, including accumulated amortization of finance leases		(103,839,000)	(106,553,000)
Property, plant, and equipment - net		58,222,000	62,085,000
Depreciation		8,051,000	7,850,000
Asset impairment		0
Discontinued Operations, Disposed of by Sale
Property, Plant and Equipment
Proceeds from divestiture of businesses	$ 23,902,000
Land
Property, Plant and Equipment
Gross property, plant, and equipment		6,224,000	6,627,000
Improvements to land and leaseholds
Property, Plant and Equipment
Gross property, plant, and equipment		15,416,000	17,573,000
Buildings
Property, Plant and Equipment
Gross property, plant, and equipment		27,206,000	27,348,000
Machinery and equipment, including equipment under finance leases
Property, Plant and Equipment
Gross property, plant, and equipment		112,021,000	116,175,000
Construction in progress
Property, Plant and Equipment
Gross property, plant, and equipment		$ 1,194,000	$ 915,000