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Note 16 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | [1] | Sep. 30, 2020 | [2] | Jun. 30, 2020 | [3] | Mar. 31, 2020 | [4] | Dec. 31, 2019 | Sep. 30, 2019 | [5] | Jun. 30, 2019 | [6] | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Net revenues | $ 14,875 | $ 14,443 | $ 13,275 | $ 11,230 | $ 13,614 | $ 14,632 | $ 14,352 | $ 18,062 | $ 53,823 | $ 60,660
Depreciation/amortization |  |  |  |  |  |  |  |  | 1,863 | 1,942
Operating income (loss) |  |  |  |  |  |  |  |  | (1,217) | 2,549
Earnings (loss) before income tax expense (benefit) | (454) | 433 | 183 | (1,393) | 648 | 794 | (300) | 1,462 | (1,231) | 2,604
Income tax expense (benefit) | (74) | (25) | 13 | (250) | (76) | 147 | (113) | 324 | (336) | 282
Net earnings (loss) | $ (380) | $ 458 | $ 170 | $ (1,143) | $ 724 | $ 647 | $ (187) | $ 1,138 | (895) | 2,322
Capital expenditures |  |  |  |  |  |  |  |  | 658 | 620
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |
Depreciation/amortization |  |  |  |  |  |  |  |  | 27 | 14
Operating income (loss) |  |  |  |  |  |  |  |  | (429) | (1,510)
Earnings (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | (460) | (1,533)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (126) | (169)
Net earnings (loss) |  |  |  |  |  |  |  |  | (334) | (1,364)
Capital expenditures |  |  |  |  |  |  |  |  | 3 | 73
Thermal Testing Products [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 40,209 | 43,823
Depreciation/amortization |  |  |  |  |  |  |  |  | 1,727 | 1,810
Operating income (loss) |  |  |  |  |  |  |  |  | 325 | 2,334
Earnings (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 306 | 2,370
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 84 | 257
Net earnings (loss) |  |  |  |  |  |  |  |  | 222 | 2,113
Capital expenditures |  |  |  |  |  |  |  |  | 371 | 501
EMS [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 13,614 | 16,837
Depreciation/amortization |  |  |  |  |  |  |  |  | 109 | 118
Operating income (loss) |  |  |  |  |  |  |  |  | (1,113) | 1,725
Earnings (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,077) | 1,767
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (294) | 194
Net earnings (loss) |  |  |  |  |  |  |  |  | (783) | 1,573
Capital expenditures |  |  |  |  |  |  |  |  | $ 284 | $ 46
[1] | The quarter ended December 31, 2020 includes $1,078 of restructuring and other charges which are discussed in Note 3.
[2] | The quarter ended September 30, 2020 includes $161 of restructuring and other charges which are discussed in Note 3.
[3] | The quarter ended June 30, 2020 includes $38 of restructuring and other charges which are discussed in Note 3.
[4] | The quarter ended March 31, 2020 includes $8 of restructuring and other charges which are discussed in Note 3.
[5] | The quarter ended September 30, 2019 includes $17 of restructuring and other charges which are discussed in Note 3.
[6] | The quarter ended June 30, 2019 includes $223 of restructuring and other charges which are discussed in Note 3.

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