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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [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:
 
2017
 
2016
Land and land improvements
$
6,009,000

 
$
5,958,000

Buildings
42,769,000

 
42,593,000

Machinery and equipment
92,218,000

 
89,692,000

Tools, dies, and patterns
808,000

 
808,000

Additions in progress
3,045,000

 
1,607,000

Total
144,849,000

 
140,658,000

Less accumulated depreciation
(76,218,000
)
 
(70,057,000
)
Property, plant, and equipment - net
$
68,631,000

 
$
70,601,000