Note 10 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net revenues	$ 58,994	$ 61,097
Operating income (loss)	2,067	2,718
Interest expense	149	147
Other (income), net	(87)	(75)
Income before income tax expense	2,005	2,646
Income tax expense	551	865
Net income	1,454	1,781
Total net (income) attributable to non-controlling interest	(780)	(864)
Net income attributable to SPAR Group, Inc.	674	917
Depreciation and amortization	510	530
Capital expenditures	478	332
Americas [Member]
Net revenues	42,978	45,114
Operating income (loss)	1,780	2,328
Interest expense	101	134
Other (income), net	(7)	14
Income before income tax expense	1,686	2,180
Income tax expense	370	791
Net income	1,316	1,389
Total net (income) attributable to non-controlling interest	(548)	(515)
Net income attributable to SPAR Group, Inc.	768	874
Depreciation and amortization	485	502
Capital expenditures	466	294
Asia Pacific [Member]
Net revenues	6,818	8,262
Operating income (loss)	(441)	23
Interest expense	(1)	7
Other (income), net	(16)	(47)
Income before income tax expense	(424)	63
Income tax expense	(6)	49
Net income	(418)	14
Total net (income) attributable to non-controlling interest	153	(4)
Net income attributable to SPAR Group, Inc.	(265)	10
Depreciation and amortization	14	18
Capital expenditures	5	36
EMEA [Member]
Net revenues	9,198	7,721
Operating income (loss)	728	367
Interest expense	49	6
Other (income), net	(64)	(42)
Income before income tax expense	743	403
Income tax expense	187	25
Net income	556	378
Total net (income) attributable to non-controlling interest	(385)	(345)
Net income attributable to SPAR Group, Inc.	171	33
Depreciation and amortization	11	10
Capital expenditures	$ 7	$ 2