Note 5 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Cost	$ 28,379	$ 28,454
Accumulated Amortization	11,336	11,064
Net	17,043	17,390
Customer Relationships [Member]
Cost	13,170	13,214
Accumulated Amortization	5,614	5,484
Net	7,556	7,730
Patented Technology [Member]
Cost	5,637	5,667
Accumulated Amortization	5,137	5,126
Net	500	541
Trade Names [Member]
Cost	4,659	4,670
Accumulated Amortization	458	436
Net	4,201	4,234
Trademarks [Member]
Cost	3,413	3,413
Accumulated Amortization	0	0
Net	3,413	3,413
Other Intangible Assets [Member]
Cost	1,500	1,490
Accumulated Amortization	127	18
Net	$ 1,373	$ 1,472