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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
2015
 
2014
Land and land improvements
$
5,958,000

 
$
5,098,000

Buildings
41,417,000

 
37,143,000

Machinery and equipment
87,482,000

 
75,905,000

Tools, dies, and patterns
808,000

 
808,000

Additions in progress
2,331,000

 
979,000

Total
137,996,000

 
119,933,000

Less accumulated depreciation
(63,893,000
)
 
(57,938,000
)
Property, plant, and equipment - net
$
74,103,000

 
$
61,995,000