Note 12 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net revenues	$ 255,719	$ 230,517
Operating (loss) income	4,183	9,722
Interest expense (income), net	(585)	(690)
Interest expense (income), net	585	690
Other (income) expense, net	(510)	(242)
Other expense (income), net	(510)	(242)
Total:	4,108	9,274
Income tax expense (benefit)	2,108	312
Net income	2,000	8,962
Net income attributable to non-controlling interest	(3,779)	(5,595)
Net income (loss) attributable to SPAR Group, Inc.	(1,779)	3,367
Depreciation and amortization	2,083	2,130
Capital expenditures	1,722	1,600
Domestic Operations [Member]
Net revenues	100,326	92,118
Operating (loss) income	(4,228)	1,876
Interest expense (income), net	624	650
Interest expense (income), net	(624)	(650)
Other (income) expense, net	15	8
Other expense (income), net	15	8
Total:	(5,672)	603
Income tax expense (benefit)	(1,332)	133
Net income	(4,340)	470
Net income attributable to non-controlling interest	(196)	(883)
Net income (loss) attributable to SPAR Group, Inc.	(3,730)	202
Depreciation and amortization	1,554	1,620
Capital expenditures	1,397	1,360
International Segment [Member]
Net revenues	155,393	138,399
Operating (loss) income	8,411	7,846
Interest expense (income), net	39	(40)
Interest expense (income), net	(39)	40
Other (income) expense, net	(525)	(250)
Other expense (income), net	(525)	(250)
Total:	9,780	8,671
Income tax expense (benefit)	3,440	179
Net income	6,340	8,492
Net income attributable to non-controlling interest	(3,583)	(4,712)
Net income (loss) attributable to SPAR Group, Inc.	1,951	3,165
Depreciation and amortization	529	510
Capital expenditures	$ 325	$ 240