Note 7 - Long-lived Assets - Cost Basis and Estimated Lives of Property and Equipment from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Property and equipment, gross	$ 150,373	$ 146,609
Less accumulated depreciation and amortization	(105,178)	(99,669)
Total property and equipment	45,195	46,940
Land [Member]
Property and equipment, gross	1,423	1,423
Building [Member]
Property and equipment, gross	$ 20,778	20,747
Life (Year)	39 years
Machinery and Equipment [Member]
Property and equipment, gross	$ 113,266	109,775
Machinery and Equipment [Member] \| Minimum [Member]
Life (Year)	2 years
Machinery and Equipment [Member] \| Maximum [Member]
Life (Year)	10 years
Office Equipment [Member]
Property and equipment, gross	$ 5,099	4,597
Office Equipment [Member] \| Minimum [Member]
Life (Year)	3 years
Office Equipment [Member] \| Maximum [Member]
Life (Year)	7 years
Leasehold Improvements [Member]
Property and equipment, gross	$ 9,305	8,974
Construction in Progress [Member]
Property and equipment, gross	$ 502	$ 1,093

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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