Note 9 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue:	$ 68,693	$ 64,380
Operating income (loss):	9,572	3,150
Interest expense (income):	530	390
Other expense (income), net:	7	(58)
Income before income tax expense:	9,035	2,818
Income tax expense:	1,854	1,041
Net income (loss):	7,181	1,777
Net income attributable to non-controlling interest:	(554)	(911)
Net income attributable to non-controlling interest:	554	911
Net (loss) income attributable to SPAR Group, Inc.:	6,627	866
Depreciation and amortization:	511	532
Capital expenditures	432	343
Americas [Member]
Revenue:	54,655	48,578
Operating income (loss):	9,427	2,521
Interest expense (income):	426	274
Other expense (income), net:	(15)	28
Income before income tax expense:	9,461	2,219
Income tax expense:	1,777	755
Net income (loss):	7,685	1,464
Net income attributable to non-controlling interest:	282	485
Net income attributable to non-controlling interest:	(282)	(485)
Net (loss) income attributable to SPAR Group, Inc.:	7,403	979
Depreciation and amortization:	442	462
Capital expenditures	416	289
Asia Pacific [Member]
Revenue:	5,761	6,100
Operating income (loss):	(216)	(192)
Interest expense (income):	13	(1)
Other expense (income), net:	32	(6)
Income before income tax expense:	531	(185)
Income tax expense:	8	21
Net income (loss):	523	(206)
Net income attributable to non-controlling interest:	(18)	4
Net income attributable to non-controlling interest:	18	(4)
Net (loss) income attributable to SPAR Group, Inc.:	541	(210)
Depreciation and amortization:	32	13
Capital expenditures	11	5
EMEA [Member]
Revenue:	8,277	9,702
Operating income (loss):	361	821
Interest expense (income):	91	117
Other expense (income), net:	(10)	(80)
Income before income tax expense:	(957)	784
Income tax expense:	69	265
Net income (loss):	(1,027)	519
Net income attributable to non-controlling interest:	290	422
Net income attributable to non-controlling interest:	(290)	(422)
Net (loss) income attributable to SPAR Group, Inc.:	(1,317)	97
Depreciation and amortization:	37	57
Capital expenditures	$ 5	$ 49