COMMITMENTS (Details - Operating Leases) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Future minimum payments under operating lease
Operating Leases, Future Minimum Payments, Due in One Year	$ 1,754
Operating Leases, Future Minimum Payments, Due in Two Years	1,811
Operating Leases, Future Minimum Payments, Due in Three Years	1,389
Operating Leases, Future Minimum Payments, Due in Four Years	63
Operating Leases, Future Minimum Payments, Due in Five Years	59
Total	5,076
Operating Leases, Rent Expense, Net	$ 2,000	$ 1,600	$ 1,200