4. PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment
Total property, plant and equipment	$ 23,498	$ 19,133
Less: Accumulated depreciation and amortization	(11,146)	(11,195)
Property, plant and equipment, net	12,352	7,938
Building and improvements [Member]
Property Plant And Equipment
Total property, plant and equipment	$ 285	5
Range of Asset Lives	7 to 36 years
Leasehold Improvements [Member]
Property Plant And Equipment
Total property, plant and equipment	$ 908	908
Range of Asset Lives	2 to 5 years
Equipment [Member]
Property Plant And Equipment
Total property, plant and equipment	$ 18,933	16,360
Range of Asset Lives	2 to 30 years
Furniture, computers and office equipment [Member]
Property Plant And Equipment
Total property, plant and equipment	$ 1,245	1,274
Range of Asset Lives	2 to 8 years
Construction in Progress [Member]
Property Plant And Equipment
Total property, plant and equipment	$ 2,127	$ 586