Note 6 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property and equipment, at cost	$ 416,511	$ 403,785
Accumulated depreciation	(260,264)	(244,176)
Net property and equipment	$ 156,247	159,609
Minimum [Member]
Depreciable lives (Year)	2 years
Maximum [Member]
Depreciable lives (Year)	30 years
Land [Member]
Property and equipment, at cost	$ 16,046	15,881
Land Improvements [Member]
Property and equipment, at cost	$ 3,675	3,547
Land Improvements [Member] \| Minimum [Member]
Depreciable lives (Year)	5 years
Land Improvements [Member] \| Maximum [Member]
Depreciable lives (Year)	10 years
Building and Building Improvements [Member]
Property and equipment, at cost	$ 142,663	133,386
Building and Building Improvements [Member] \| Minimum [Member]
Depreciable lives (Year)	7 years
Building and Building Improvements [Member] \| Maximum [Member]
Depreciable lives (Year)	30 years
Machinery and Equipment [Member]
Property and equipment, at cost	$ 213,994	205,826
Machinery and Equipment [Member] \| Minimum [Member]
Depreciable lives (Year)	2 years
Machinery and Equipment [Member] \| Maximum [Member]
Depreciable lives (Year)	15 years
Furniture and Fixtures [Member]
Property and equipment, at cost	$ 6,493	6,374
Furniture and Fixtures [Member] \| Minimum [Member]
Depreciable lives (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Depreciable lives (Year)	7 years
Software and Software Development Costs [Member]
Property and equipment, at cost	$ 28,653	28,638
Depreciable lives (Year)	5 years
Software and Software Development Costs [Member] \| Minimum [Member]
Depreciable lives (Year)	2 years
Software and Software Development Costs [Member] \| Maximum [Member]
Depreciable lives (Year)	5 years
Vehicles [Member]
Property and equipment, at cost	$ 2,272	1,876
Vehicles [Member] \| Minimum [Member]
Depreciable lives (Year)	2 years
Vehicles [Member] \| Maximum [Member]
Depreciable lives (Year)	5 years
Assets Held under Capital Leases [Member]
Property and equipment, at cost		86
Construction in Progress [Member]
Property and equipment, at cost	$ 2,715	$ 8,171

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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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