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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

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