L. INCOME TAXES - DEFERRED INCOME TAXES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
NOL Carryforward	$ 7,739	$ 12,866
Inventory reserves	837	869
AMT credit	345	424
Unrealized gains and losses	92
Unrealized loss		(6)
Share-based compensation	732	1,453
Foreign tax credit	2,018
Research and development credits	4,626
Other	573	255
Subtotal	16,962	15,861
Less valuation allowance		(1,663)
Deferred tax assets, net	16,962	14,198
Depreciation and amortization	(4,161)	(2,777)
Deferred tax liabilities	(4,161)	(2,777)
Deferred tax assets, net	$ 12,801	$ 11,421