Note 4 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	[1]
Net loss attributable to SPAR Group, Inc.	$ (244)	$ (139)
Weighted average shares used in basic and diluted net income per share calculation (in shares)	20,649	20,563
Basic and diluted net loss per common share (in dollars per share)	$ (0.01)	$ (0.01)

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