Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Net Carrying Amount	$ 19,907	$ 21,634
Finite-lived, Gross Carrying Amount	20,835	21,015
Finite-lived, Accumulated Amortization	9,335	7,809
Net Carrying Amount, finite-lived	11,500	13,206
Indefinite-lived, Gross Carrying Amount	8,407	8,428
Net Carrying Amount, indefinite-lived	8,407	8,428
Intangible Assets, Gross Carrying Amount	29,242	29,443
Net Carrying Amount	19,907	21,634
Trademarks [Member]
Indefinite-lived, Gross Carrying Amount	8,407	8,428
Net Carrying Amount, indefinite-lived	8,407	8,428
Customer Relationships [Member]
Finite-lived, Gross Carrying Amount	16,428	16,544
Finite-lived, Accumulated Amortization	7,093	6,160
Net Carrying Amount, finite-lived	9,335	10,384
Patented Technology [Member]
Finite-lived, Gross Carrying Amount	2,912	2,950
Finite-lived, Accumulated Amortization	788	569
Net Carrying Amount, finite-lived	2,124	2,381
Patents [Member]
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	588	585
Net Carrying Amount, finite-lived	2	5
Customer Backlog [Member]
Finite-lived, Gross Carrying Amount	495	521
Finite-lived, Accumulated Amortization	456	85
Net Carrying Amount, finite-lived	39	436
Computer Software, Intangible Asset [Member]
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	270	270
Net Carrying Amount, finite-lived	0	0
Trade Names [Member]
Finite-lived, Gross Carrying Amount	140	140
Finite-lived, Accumulated Amortization	140	140
Net Carrying Amount, finite-lived	0	0
Electronic Test [Member]
Net Carrying Amount	4,632	5,074
Net Carrying Amount	4,632	5,074
Environmental Technologies [Member]
Net Carrying Amount	862	893
Net Carrying Amount	862	893
Process Technologies [Member]
Net Carrying Amount	14,413	15,667
Net Carrying Amount	$ 14,413	$ 15,667