Note 5 - Net Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2017		2016
Finished goods	$	41,521	$	29,117
Work in process		47,386		54,463
Raw materials		42,491		33,841
Supplies		7,144		5,763
Total	$	138,542	$	123,184