Note 5 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Goodwill	$ 33,278	$ 21,728
Net Carrying Amount	28,819	16,596
Finite-lived, Gross Carrying Amount	30,248	20,801
Finite-lived, Accumulated Amortization	13,160	12,603
Net Carrying Amount, finite-lived	17,088	8,198
Indefinite-lived, Gross Carrying Amount	11,731	8,398
Net Carrying Amount, indefinite-lived	11,731	8,398
Intangible Assets, Gross Carrying Amount	41,979	29,199
Net Carrying Amount	28,819	16,596
Intangible Assets, Gross Carrying Amount	41,979	29,199
Net Carrying Amount	28,819	16,596
Trademarks [Member]
Indefinite-lived, Gross Carrying Amount	11,731	8,398
Net Carrying Amount, indefinite-lived	11,731	8,398
Customer Relationships [Member]
Finite-lived, Gross Carrying Amount	22,202	16,407
Finite-lived, Accumulated Amortization	10,082	9,687
Net Carrying Amount, finite-lived	12,120	6,720
Patented Technology [Member]
Finite-lived, Gross Carrying Amount	3,195	2,895
Finite-lived, Accumulated Amortization	1,504	1,417
Net Carrying Amount, finite-lived	1,691	1,478
Patents [Member]
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	590	590
Customer Backlog [Member]
Finite-lived, Gross Carrying Amount	3,851	499
Finite-lived, Accumulated Amortization	574	499
Computer Software, Intangible Asset [Member]
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	270	270
Trade Names [Member]
Finite-lived, Gross Carrying Amount	140	140
Finite-lived, Accumulated Amortization	140	140
Electronic Test [Member]
Goodwill	15,026	3,436
Net Carrying Amount	16,357	3,728
Net Carrying Amount	16,357	3,728
Net Carrying Amount	16,357	3,728
Environmental Technologies [Member]
Goodwill	1,817	1,817
Net Carrying Amount	796	794
Net Carrying Amount	796	794
Net Carrying Amount	796	794
Process Technologies [Member]
Goodwill	16,435	16,475
Net Carrying Amount	11,666	12,074
Net Carrying Amount	11,666	12,074
Net Carrying Amount	$ 11,666	$ 12,074