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Property, Plant & Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Components of property, plant and equipment
Ranges of estimated useful lives for computing depreciation are as follows:
Land improvements
 
20 years
Buildings and improvements
 
20 - 40 years
Machinery and equipment
 
3 - 15 years
Tools, dies and patterns
 
3 - 5 years
Property, plant, and equipment consisted of the following at December 31:
 
2018
 
2017
Land and land improvements
$
6,009,000

 
$
6,009,000

Buildings
43,042,000

 
42,769,000

Machinery and equipment
108,661,000

 
92,218,000

Tools, dies, and patterns
1,419,000

 
808,000

Additions in progress
5,014,000

 
3,045,000

Total
164,145,000

 
144,849,000

Less accumulated depreciation
(83,488,000
)
 
(76,218,000
)
Property, plant, and equipment - net
$
80,657,000

 
$
68,631,000