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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment
Property, plant and equipment, gross	$ 13,238	$ 13,384
Less: accumulated depreciation and amortization	6,074	5,603
Property, plant and equipment net, excluding land	7,164	7,781
Land	134	134
Property, plant and equipment, net	7,298	7,915
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, gross	$ 7,972	8,083
Buildings and improvements | Minimum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	15 years
Buildings and improvements | Maximum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	25 years
Office equipment and furniture
Property, plant and equipment
Property, plant and equipment, gross	$ 2,135	2,126
Office equipment and furniture | Minimum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	2 years
Office equipment and furniture | Maximum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	7 years
Automobiles and trucks
Property, plant and equipment
Property, plant and equipment, gross	$ 157	118
Automobiles and trucks | Minimum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	2 years
Automobiles and trucks | Maximum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	5 years
Machinery and shop equipment
Property, plant and equipment
Property, plant and equipment, gross	$ 2,951	2,963
Machinery and shop equipment | Minimum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	2 years
Machinery and shop equipment | Maximum
Property, plant and equipment
Property, plant and equipment, Estimated Useful Lives (years)	10 years
Construction in Progress
Property, plant and equipment
Property, plant and equipment, gross	$ 23	$ 94

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Property plant and equipment net excluding land.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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