Note 9 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:	$ 65,936		$ 67,799		$ 130,316	$ 126,794
Operating income (loss):	1,997		2,357		5,147	4,425
Interest expense (income):	478		178		868	328
Other expense (income), net:	(125)		(149)		(183)	(237)
Income before income tax expense:	1,644		2,328		4,462	4,334
Income tax expense:	538		715		1,579	1,266
Net income (loss):	1,106	$ 1,777	1,613	$ 1,455	2,883	3,068
Net income attributable to non-controlling interest:	(467)		(464)		(1,378)	(1,247)
Net (loss) income attributable to SPAR Group, Inc.:	639		1,149		1,505	1,821
Depreciation and amortization:	494		507		1,026	1,017
Capital expenditures	376		336		717	794
Americas [Member]
Revenue:	52,083		53,274		100,661	96,253
Operating income (loss):	2,038		2,636		4,553	4,419
Interest expense (income):	357		99		631	201
Other expense (income), net:	(12)		(4)		17	(11)
Income before income tax expense:	1,693		2,541		3,905	4,229
Income tax expense:	456		509		1,223	877
Net income (loss):	1,237		2,032		2,682	3,352
Net income attributable to non-controlling interest:	(394)		(525)		(879)	(1,076)
Net (loss) income attributable to SPAR Group, Inc.:	843		1,507		1,803	2,276
Depreciation and amortization:	466		487		930	972
Capital expenditures	371		330		660	780
Asia Pacific [Member]
Revenue:	5,658		5,386		11,758	12,205
Operating income (loss):	(97)		(713)		(289)	(1,155)
Interest expense (income):	17		18		16	17
Other expense (income), net:	(4)		4		(10)	(12)
Income before income tax expense:	(110)		(735)		(295)	(1,160)
Income tax expense:	(53)		46		(35)	41
Net income (loss):	(57)		(781)		(260)	(1,201)
Net income attributable to non-controlling interest:	(12)		367		(16)	520
Net (loss) income attributable to SPAR Group, Inc.:	(69)		(414)		(276)	(681)
Depreciation and amortization:	12		11		24	25
Capital expenditures	3		6		6	14
EMEA [Member]
Revenue:	8,195		9,139		17,897	18,336
Operating income (loss):	56		434		883	1,161
Interest expense (income):	104		61		221	110
Other expense (income), net:	(109)		(149)		(190)	(214)
Income before income tax expense:	61		522		852	1,265
Income tax expense:	135		160		391	348
Net income (loss):	(74)		362		461	917
Net income attributable to non-controlling interest:	(61)		(306)		(483)	(691)
Net (loss) income attributable to SPAR Group, Inc.:	(135)		56		(22)	226
Depreciation and amortization:	16		9		72	20
Capital expenditures	$ 2		$ 0		$ 51	$ 0