Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, plant and equipment
Property and equipment, gross	$ 80,982	$ 71,253
Less: Accumulated depreciation	63,223	60,271
Property, plant and equipment, excluding construction in progress, net	17,759	10,982
Construction in progress	1,259	1,049
Total	19,018	12,031
Depreciation expense	3,200	2,400	$ 1,900
Railroad and equipment
Property, plant and equipment
Property and equipment, gross	33,626	33,626
Furniture and fixtures
Property, plant and equipment
Property and equipment, gross	24,062	22,438
Machinery and equipment
Property, plant and equipment
Property and equipment, gross	11,100	8,964
Office equipment
Property, plant and equipment
Property and equipment, gross	5,920	5,237
Autos and trucks
Property, plant and equipment
Property and equipment, gross	$ 6,274	$ 988

Property, plant and equipment, excluding construction in progress, net.

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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.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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