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Note 9 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net revenues | $ 67,176 |  | $ 50,944 |  | $ 128,273 | $ 112,292
Operating income (loss) | 1,887 |  | 1,963 |  | 4,606 | 3,440
Interest expense | 129 |  | 84 |  | 277 | 312
Other income, net | 5 |  | (50) |  | (70) | (58)
Income before income tax expense | 1,753 |  | 1,929 |  | 4,399 | 3,186
Income tax expense | 621 |  | 624 |  | 1,486 | 959
Net income | 1,132 | $ 1,781 | 1,305 | $ 922 | 2,913 | 2,227
Net income (loss) attributable to non-controlling interest | (618) |  | (1,408) |  | (1,482) | (2,034)
Net income (loss) attributable to SPAR Group, Inc. | 514 |  | (103) |  | 1,431 | 193
Depreciation and amortization | 534 |  | 539 |  | 1,064 | 1,079
Capital expenditures | 559 |  | 444 |  | 890 | 786
US Segment [Member] |  |  |  |  |  |
Net revenues | 27,252 |  | 22,123 |  | 50,927 | 45,412
Operating income (loss) | 332 |  | 315 |  | 1,090 | 623
Interest expense | 151 |  | 144 |  | 289 | 276
Other income, net | (1) |  | (1) |  | (3) | (1)
Income before income tax expense | 182 |  | 172 |  | 804 | 348
Income tax expense | 7 |  | 124 |  | 176 | 199
Net income | 175 |  | 48 |  | 628 | 149
Net income (loss) attributable to non-controlling interest | (2) |  | (519) |  | (82) | (583)
Net income (loss) attributable to SPAR Group, Inc. | 173 |  | (471) |  | 546 | (434)
Depreciation and amortization | 385 |  | 419 |  | 775 | 832
Capital expenditures | 352 |  | 288 |  | 637 | 669
International Segment [Member] |  |  |  |  |  |
Net revenues | 39,924 |  | 28,821 |  | 77,346 | 66,880
Operating income (loss) | 1,555 |  | 1,648 |  | 3,516 | 2,817
Interest expense | (22) |  | (60) |  | (12) | 36
Other income, net | 6 |  | (49) |  | (67) | (57)
Income before income tax expense | 1,571 |  | 1,757 |  | 3,595 | 2,838
Income tax expense | 614 |  | 500 |  | 1,310 | 760
Net income | 957 |  | 1,257 |  | 2,285 | 2,078
Net income (loss) attributable to non-controlling interest | (616) |  | (889) |  | (1,400) | (1,451)
Net income (loss) attributable to SPAR Group, Inc. | 341 |  | 368 |  | 885 | 627
Depreciation and amortization | 149 |  | 120 |  | 289 | 247
Capital expenditures | $ 207 |  | $ 156 |  | $ 253 | $ 117

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