Note 5 - Net Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 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