4. PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 20,033	$ 21,157
Less: Accumulated depreciation and amortization	(12,069)	(11,466)
Property, plant and equipment, net	7,964	9,691
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 285	285
Range of Asset Lives	7 to 36 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 896	908
Range of Asset Lives	2 to 5 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 17,887	18,640
Range of Asset Lives	2 to 30 years
Furniture, computers and office equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 901	1,166
Range of Asset Lives	2 to 8 years
Construction in Progess [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 64	$ 158