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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, plant and equipment, gross	$ 1,189,173	$ 1,191,864
Less: Accumulated depreciation	(944,716)	(919,157)
Total property, plant and equipment, net	244,457	272,707
Land [Member]
Property, plant and equipment, gross	31,148	30,869
Land Improvements [Member]
Property, plant and equipment, gross	$ 7,624	7,620
Land Improvements [Member] | Minimum [Member]
Estimated useful lives (Year)	8 years
Land Improvements [Member] | Maximum [Member]
Estimated useful lives (Year)	15 years
Building and Building Improvements [Member]
Property, plant and equipment, gross	$ 118,864	121,105
Building and Building Improvements [Member] | Minimum [Member]
Estimated useful lives (Year)	13 years
Building and Building Improvements [Member] | Maximum [Member]
Estimated useful lives (Year)	39 years
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 906,067	897,398
Machinery and Equipment [Member] | Minimum [Member]
Estimated useful lives (Year)	2 years
Machinery and Equipment [Member] | Maximum [Member]
Estimated useful lives (Year)	7 years
Other Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 55,282	54,842
Estimated useful lives (Year)	7 years
Furniture, Fixtures and Computers [Member]
Property, plant and equipment, gross	$ 19,809	16,928
Furniture, Fixtures and Computers [Member] | Minimum [Member]
Estimated useful lives (Year)	3 years
Furniture, Fixtures and Computers [Member] | Maximum [Member]
Estimated useful lives (Year)	5 years
Vehicles [Member]
Property, plant and equipment, gross	$ 25,861	25,948
Estimated useful lives (Year)	5 years
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 12,652	12,773
Construction in Progress [Member]
Property, plant and equipment, gross	$ 11,866	$ 24,381

X

- Definition

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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