Note 3 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net (loss) income attributable to SPAR Group, Inc.	$ (58)	$ (92)	$ 84	$ (137)
Weighted average common shares – basic (in shares)	20,607	20,556	20,580	20,562
Weighted average common shares – diluted (in shares)	20,607	20,556	21,299	20,562
Basic and diluted loss per common share: (in dollars per share)				$ (0.01)