Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Net Carrying Amount	$ 16,959	$ 18,559
Finite-lived, Gross Carrying Amount	20,634	20,660
Finite-lived, Accumulated Amortization	12,039	10,470
Net Carrying Amount, finite-lived	8,595	10,190
Indefinite-lived, Gross Carrying Amount	8,364	8,369
Net Carrying Amount, indefinite-lived	8,364	8,369
Intangible Assets, Gross Carrying Amount	28,998	29,029
Net Carrying Amount	16,959	18,559
Trademarks [Member]
Indefinite-lived, Gross Carrying Amount	8,364	8,369
Net Carrying Amount, indefinite-lived	8,364	8,369
Customer Relationships [Member]
Finite-lived, Gross Carrying Amount	16,296	16,313
Finite-lived, Accumulated Amortization	9,251	7,990
Net Carrying Amount, finite-lived	7,045	8,323
Patented Technology [Member]
Finite-lived, Gross Carrying Amount	2,848	2,855
Finite-lived, Accumulated Amortization	1,298	988
Net Carrying Amount, finite-lived	1,550	1,867
Patents [Member]
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	590	590
Net Carrying Amount, finite-lived	0	0
Customer Backlog [Member]
Finite-lived, Gross Carrying Amount	490	492
Finite-lived, Accumulated Amortization	490	492
Net Carrying Amount, finite-lived	0	0
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	3,761	4,139
Net Carrying Amount	3,761	4,139
Environmental Technologies [Member]
Net Carrying Amount	804	832
Net Carrying Amount	804	832
Process Technologies [Member]
Net Carrying Amount	12,394	13,588
Net Carrying Amount	$ 12,394	$ 13,588