Note 8 - Long-lived Assets - Cost Basis and Estimated Lives of Property and Equipment from Continuing Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property and equipment, gross	$ 167,197	$ 160,213
Less accumulated depreciation and amortization	(120,074)	(114,894)
Total property and equipment	47,123	45,319
Land [Member]
Property and equipment, gross	1,423	1,423
Building [Member]
Property and equipment, gross	$ 22,111	20,792
Life (Year)	39 years
Machinery and Equipment [Member]
Property and equipment, gross	$ 125,107	120,893
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	$ 5,962	5,705
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	$ 9,068	9,040
Construction in Progress [Member]
Property and equipment, gross	$ 3,526	$ 2,360