Note 5 - Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Gross	$ 289,188	$ 309,095
Less – Accumulated depreciation	(188,097)	(202,036)
Property, plant & equipment, less accumulated depreciation	101,091	107,059
Land and Land Improvements [Member]
Property, Plant and Equipment, Gross	$ 5,359	10,521
Land and Land Improvements [Member] \| Minimum [Member]
Estimated Useful Lives (Year)	5 years
Land and Land Improvements [Member] \| Maximum [Member]
Estimated Useful Lives (Year)	40 years
Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Gross	$ 50,589	47,430
Land, Buildings and Improvements [Member] \| Minimum [Member]
Estimated Useful Lives (Year)	4 years
Land, Buildings and Improvements [Member] \| Maximum [Member]
Estimated Useful Lives (Year)	10 years
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	$ 143,128	147,918
Machinery and Equipment [Member] \| Minimum [Member]
Estimated Useful Lives (Year)	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Estimated Useful Lives (Year)	10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 35,440	37,471
Furniture and Fixtures [Member] \| Minimum [Member]
Estimated Useful Lives (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Estimated Useful Lives (Year)	10 years
Vehicles [Member]
Property, Plant and Equipment, Gross	$ 47,197	51,129
Construction in Progress [Member]
Property, Plant and Equipment, Gross	$ 7,475	$ 14,626

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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