Note 6 - Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant, and Equipment, Gross	$ 540,149	$ 511,192
Accumulated depreciation	(323,057)	(324,705)
Net	217,092	186,487
Land [Member]
Property, Plant, and Equipment, Gross	4,268	4,122
Building and Building Improvements [Member]
Property, Plant, and Equipment, Gross	131,794	106,983
Machinery and Equipment [Member]
Property, Plant, and Equipment, Gross	377,990	358,540
Furniture and Fixtures [Member]
Property, Plant, and Equipment, Gross	1,995	1,734
Construction in Progress [Member]
Property, Plant, and Equipment, Gross	$ 24,102	$ 39,813

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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