Note 12 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenue, Net	$ 134,324	$ 119,279
Operating income (loss)	2,202	3,265
Interest expense	133	214
Other income, net	(128)	(243)
Total:	2,197	3,294
Net expense	441	819
Net income (loss) from continuing operations	1,756	2,475
Net income attributable to non-controlling interest	(1,583)	(1,583)
Net income attributable to SPAR Group, Inc.	173	892
Depreciation and amortization	2,100	1,905
Total Capital expenditures	1,555	1,575
UNITED STATES
Revenue, Net	44,979	43,612
Operating income (loss)	(53)	609
Interest expense	130	92
Other income, net
Total:	(183)	517
Net expense	(428)	(65)
Net income (loss) from continuing operations	245	582
Net income attributable to non-controlling interest	(182)	(195)
Net income attributable to SPAR Group, Inc.	63	387
Depreciation and amortization	1,356	1,350
Total Capital expenditures	991	1,118
International [Member]
Revenue, Net	89,345	75,667
Operating income (loss)	2,255	2,656
Interest expense	3	122
Other income, net	(128)	(243)
Total:	2,380	2,777
Net expense	869	884
Net income (loss) from continuing operations	1,511	1,893
Net income attributable to non-controlling interest	(1,401)	(1,388)
Net income attributable to SPAR Group, Inc.	110	505
Depreciation and amortization	744	555
Total Capital expenditures	$ 564	$ 457