Note 6 - Goodwill and Intangible Assets - Component of Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 21, 2021	Oct. 28, 2021	Oct. 06, 2021	Dec. 31, 2020
Goodwill	$ 21,448				$ 13,738
Thermal [Member]
Goodwill	18,393				13,738
EMS [Member]
Goodwill	21,448				13,738
Sigma [Member] | Thermal [Member]
Goodwill	1,656				1,656
Thermonics [Member] | Thermal [Member]
Goodwill	50				50
Ambrell [Member] | Thermal [Member]
Goodwill	12,032				12,032
Z-Sciences [Member]
Goodwill				$ 111
Z-Sciences [Member] | Thermal [Member]
Goodwill	111				0
Videology [Member]
Goodwill			$ 4,596
Videology [Member] | Thermal [Member]
Goodwill	4,544				0
Acculogic [Member]
Goodwill		$ 2,912
Acculogic [Member] | EMS [Member]
Goodwill	$ 3,055				$ 0