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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Components of property, plant and equipment
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:

 
2019
 
2018
Land and land improvements
$
6,009,000

 
$
6,009,000

Buildings
43,375,000

 
43,042,000

Machinery and equipment
118,366,000

 
108,661,000

Tools, dies, and patterns
1,516,000

 
1,419,000

Additions in progress
1,615,000

 
5,014,000

Total
170,881,000

 
164,145,000

Less accumulated depreciation
(91,675,000
)
 
(83,488,000
)
Property, plant and equipment, net

$
79,206,000

 
$
80,657,000