1. Summary of Significant Accounting Policies (Detail Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Depreciation expense	$ 8,689	$ 8,478	$ 8,454
Goodwill, carrying amount	9,730	9,730	9,730
Goodwill, impairment loss		0	0
Allowances for doubtful accounts	$ 71	$ 50	$ 22
Cash deposits in excess of federally insured limits
Significant Accounting Policies [Line Items]
Risk concentration	89.00%
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