Note 6 - Net Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Net inventories consist of the following:

	December 31,
	2018		2017
Finished goods	$	30,904	$	41,521
Work in process		27,513		47,386
Raw materials		44,705		42,491
Supplies		7,940		7,144
Total	$	111,062	$	138,542