Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 53,163	$ 52,969
Less accumulated depreciation	(32,492)	(31,921)
Total property and equipment	20,671	21,048
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,565	1,565
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,795	17,834
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	31,723	31,707
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	778	778
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	862	857
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 440	$ 228

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

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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