Note 12 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue:	$ 262,747	$ 261,268
Operating income (loss):	9,398	5,386
Interest expense (income):	1,919	965
Other expense (income), net:	346	(482)
Income before income tax expense:	7,133	4,903
Income tax expense:	2,357	2,777
Net income (loss):	4,776	2,126
Net income attributable to non-controlling interest:	(874)	(2,858)
Net income attributable to non-controlling interest:	874	2,858
Net (loss) income attributable to SPAR Group, Inc.:	3,902	(732)
Depreciation and amortization:	2,001	2,033
Impairment of goodwill	0	2,458
Capital expenditures	1,249	1,925
Capital expenditures	1,249	1,925
Americas [Member]
Revenue:	203,705	198,581
Operating income (loss):	7,240	4,103
Interest expense (income):	1,388	675
Other expense (income), net:	1,070	(38)
Income before income tax expense:	4,304	3,466
Income tax expense:	1,543	1,949
Net income (loss):	3,236	1,517
Net income attributable to non-controlling interest:	(492)	1,857
Net income attributable to non-controlling interest:	492	(1,857)
Net (loss) income attributable to SPAR Group, Inc.:	3,729	(340)
Depreciation and amortization:	1,737	1,821
Impairment of goodwill	0	2,458
Capital expenditures	1,077	1,805
Capital expenditures	1,077	1,805
Asia Pacific [Member]
Revenue:	24,480	26,009
Operating income (loss):	(599)	(1,621)
Interest expense (income):	122	39
Other expense (income), net:	(759)	(62)
Income before income tax expense:	236	(1,598)
Income tax expense:	62	(18)
Net income (loss):	(24)	(1,580)
Net income attributable to non-controlling interest:	33	(650)
Net income attributable to non-controlling interest:	(33)	650
Net (loss) income attributable to SPAR Group, Inc.:	(57)	(930)
Depreciation and amortization:	94	104
Impairment of goodwill	0	(0)
Capital expenditures	71	20
Capital expenditures	71	20
EMEA [Member]
Revenue:	34,562	36,678
Operating income (loss):	2,757	2,904
Interest expense (income):	409	251
Other expense (income), net:	35	(382)
Income before income tax expense:	2,593	3,035
Income tax expense:	752	846
Net income (loss):	1,564	2,189
Net income attributable to non-controlling interest:	1,333	1,651
Net income attributable to non-controlling interest:	(1,333)	(1,651)
Net (loss) income attributable to SPAR Group, Inc.:	230	538
Depreciation and amortization:	170	108
Impairment of goodwill	0	(0)
Capital expenditures	101	100
Capital expenditures	$ 101	$ 100