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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
Property, plant and equipment consist of the following at December 31:

 20212020
Land$4,027 $4,027 
Building and improvements95,518 93,886 
Machinery and equipment256,478 243,810 
Construction in progress16,601 15,680 
 372,624 357,403 
Less:  Accumulated depreciation(263,761)(245,996)
 $108,863 $111,407