4. Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 7,139	$ 6,310
Work in progress	1,843	4,168
Finished goods	3,825	3,552
Supplies	775	784
Total Inventories	13,582	14,814
Inventory reserve	(429)	(826)
Net Inventories	$ 13,153	$ 13,988