1. Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Disbursements	$ 411	$ 624
Depreciation expense	8,526	8,689	$ 8,478
Goodwill, carrying amount	9,730	9,730	9,730
Goodwill, impairment loss	0	0	0
Allowances for doubtful accounts	$ 28	$ 71	$ 50
One Customer | Accounts Receivable
Significant Accounting Policies [Line Items]
Risk concentration	15.50%
Patent And License [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Patents and licenses, useful lives	7 years
Patent And License [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Patents and licenses, useful lives	20 years