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Note 5 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Revenue | $ 27,884 | $ 30,941 | $ 32,558 | $ 31,919 | $ 32,405 | $ 30,771 | $ 29,571 | $ 24,081 | $ 123,302 | $ 116,828
Semiconductor Market [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 65,735 | 68,422
Industrial Market [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 14,310 | 10,038
Automotive [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,895 | 10,776
Life Sciences [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,856 | 4,589
Defense/ Aerospace [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,537 | 7,006
Security [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,688 | 3,241
Other Multi Markets [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,281 | 12,756
Thermal Testing Products [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 21,344 | 22,246
Thermal Process [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 44,914 | 38,574
Semiconductor Production Test Products [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,235 | 28,529
Video Imaging [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,086 | 9,499
Flying Probe and In-circuit Testers [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,981 | 7,414
Service and Other Products [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 10,742 | 10,566
End User [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 85,397 | 84,468
OEM, Integrators and Distributor [Member] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 37,905 | $ 32,360

X
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