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Note 19 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | [1] | Sep. 30, 2021 | [2] | Jun. 30, 2021 | [3] | Mar. 31, 2021 | [4] | Dec. 31, 2020 | [5] | Sep. 30, 2020 | [6] | Jun. 30, 2020 | [7] | Mar. 31, 2020 | [8] | Dec. 31, 2021 | Dec. 31, 2020
Net revenues | $ 22,358 | $ 21,144 | $ 21,820 | $ 19,556 | $ 14,875 | $ 14,443 | $ 13,275 | $ 11,230 | $ 84,878 | $ 53,823
Depreciation/amortization |  |  |  |  |  |  |  |  | 2,106 | 1,863
Operating income (loss) |  |  |  |  |  |  |  |  | 8,459 | (1,217)
Earnings (loss) before income tax expense (benefit) | 236 | 2,532 | 3,056 | 2,578 | (454) | 433 | 183 | (1,393) | 8,402 | (1,231)
Income tax expense (benefit) | (51) | 357 | 447 | 366 | (74) | (25) | 13 | (250) | 1,119 | (336)
Net earnings (loss) | $ 287 | $ 2,175 | $ 2,609 | $ 2,212 | $ (380) | $ 458 | $ 170 | $ (1,143) | 7,283 | (895)
Capital expenditures |  |  |  |  |  |  |  |  | 994 | 658
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |
Depreciation/amortization |  |  |  |  |  |  |  |  | 40 | 27
Operating income (loss) |  |  |  |  |  |  |  |  | (3,731) | (429)
Earnings (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | (3,728) | (460)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (497) | (126)
Net earnings (loss) |  |  |  |  |  |  |  |  | (3,231) | (334)
Capital expenditures |  |  |  |  |  |  |  |  | 53 | 3
Thermal Testing Products [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 52,369 | 40,209
Depreciation/amortization |  |  |  |  |  |  |  |  | 1,931 | 1,727
Operating income (loss) |  |  |  |  |  |  |  |  | 2,759 | 325
Earnings (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,698 | 306
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 359 | 84
Net earnings (loss) |  |  |  |  |  |  |  |  | 2,339 | 222
Capital expenditures |  |  |  |  |  |  |  |  | 518 | 371
EMS [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 32,509 | 13,614
Depreciation/amortization |  |  |  |  |  |  |  |  | 135 | 109
Operating income (loss) |  |  |  |  |  |  |  |  | 9,431 | (1,113)
Earnings (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 9,432 | (1,077)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,257 | (294)
Net earnings (loss) |  |  |  |  |  |  |  |  | 8,175 | (783)
Capital expenditures |  |  |  |  |  |  |  |  | $ 423 | $ 284
[1] | The quarter ended December 31, 2021 includes a recovery of $17 of restructuring and other charges which are discussed in Note 5.
[2] | The quarter ended September 30, 2021 includes $51 of restructuring and other charges which are discussed in Note 5.
[3] | The quarter ended June 30, 2021 includes $197 of restructuring and other charges which are discussed in Note 5.
[4] | The quarter ended March 31, 2021 includes $55 of restructuring and other charges which are discussed in Note 5.
[5] | The quarter ended December 31, 2020 includes $1,078 of restructuring and other charges which are discussed in Note 5.
[6] | The quarter ended September 30, 2020 includes $161 of restructuring and other charges which are discussed in Note 5.
[7] | The quarter ended June 30, 2020 includes $38 of restructuring and other charges which are discussed in Note 5.
[8] | The quarter ended March 31, 2020 includes $8 of restructuring and other charges which are discussed in Note 5.

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