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Note 13 - Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thermal |  | $ | 10,724 |  |  | $ | 10,622 |  |  | $ | 29,534 |  |  | $ | 33,775 |
EMS |  |  | 3,719 |  |  |  | 4,010 |  |  |  | 9,414 |  |  |  | 13,271 |
|  | $ | 14,443 |  |  | $ | 14,632 |  |  | $ | 38,948 |  |  | $ | 47,046 |
Earnings (loss) before income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thermal |  | $ | 478 |  |  | $ | 496 |  |  | $ | 39 |  |  | $ | 1,949 |
EMS |  |  | 169 |  |  |  | 475 |  |  |  | (574 | ) |  |  | 1,624 |
Corporate |  |  | (214 | ) |  |  | (177 | ) |  |  | (242 | ) |  |  | (1,617 | )
|  | $ | 433 |  |  | $ | 794 |  |  | $ | (777 | ) |  | $ | 1,956 |
Net earnings (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thermal |  | $ | 379 |  |  | $ | 403 |  |  | $ | 26 |  |  | $ | 1,592 |
EMS |  |  | 218 |  |  |  | 387 |  |  |  | (380 | ) |  |  | 1,327 |
Corporate |  |  | (139 | ) |  |  | (143 | ) |  |  | (161 | ) |  |  | (1,321 | )
|  | $ | 458 |  |  | $ | 647 |  |  | $ | (515 | ) |  | $ | 1,598 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  | $ | 5,562 |  |  | $ | 6,226 |  |  | $ | 16,235 |  |  | $ | 19,319 |
Foreign |  |  | 8,881 |  |  |  | 8,406 |  |  |  | 22,713 |  |  |  | 27,727 |
|  | $ | 14,443 |  |  | $ | 14,632 |  |  | $ | 38,948 |  |  | $ | 47,046 |
Long-lived Assets by Geographic Areas [Table Text Block] |
|  | September 30, 2020 |  |  | December 31, 2019 |
Property and equipment: |  |  |  |  |  |  |  |
U.S. |  | $ | 2,088 |  |  | $ | 2,163 |
Foreign |  |  | 329 |  |  |  | 257 |
|  | $ | 2,417 |  |  | $ | 2,420 |
Asset [Member] |
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | September 30, 2020 |  |  | December 31, 2019 |
Identifiable assets: |  |  |  |  |  |  |  |
Thermal |  | $ | 51,920 |  |  | $ | 51,621 |
EMS |  |  | 9,940 |  |  |  | 7,319 |
Corporate |  |  | 929 |  |  |  | 775 |
|  | $ | 62,789 |  |  | $ | 59,715 |

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