Note 10 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Revenue, Net	$ 39,886		$ 26,611	[1]
Operating income (loss)	485		168	[1]
Interest expense	(46)		28	[1]
Other income, net	(62)		(24)	[1]
Income before income tax expense	593		164	[1]
Income tax expense	419		5	[1]
Net income	174	[2]	159	[1]
Net income attributable to non-controlling interest	(418)		(298)	[1]
Net loss attributable to SPAR Group, Inc.	(244)		(139)	[1]
Depreciation and amortization	505		488	[1]
Capital expenditures	360		372
US Segment [Member]
Revenue, Net	11,321		9,752
Operating income (loss)	64		(297)
Interest expense	51		24
Other income, net
Income before income tax expense	13		(321)
Income tax expense	249		(211)
Net income	(236)		(110)
Net income attributable to non-controlling interest	(26)		(39)
Net loss attributable to SPAR Group, Inc.	(262)		(149)
Depreciation and amortization	340		343
Capital expenditures	266		245
International Segment [Member]
Revenue, Net	28,565		16,859
Operating income (loss)	421		465
Interest expense	(97)		4
Other income, net	(62)		(24)
Income before income tax expense	580		485
Income tax expense	170		216
Net income	410		269
Net income attributable to non-controlling interest	(392)		(259)
Net loss attributable to SPAR Group, Inc.	18		10
Depreciation and amortization	165		145
Capital expenditures	$ 94		$ 127

[1] See Note 2 Correction of Prior Period Financial Statements.

[2] See Note 2 Correction of Prior Period Financial Statements.