Note 4 - Net Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Net inventories consist of the following:

	March 31, 2018		December 31, 2017
Finished goods	$	25,753	$	41,521
Work in process		26,626		47,386
Raw materials		44,850		42,491
Supplies		7,315		7,144
Total	$	104,544	$	138,542