Note 3 - Earnings Per Share (Detail) - Basic and diluted earnings per share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income attributable to SPAR Group, Inc. (in Dollars)	$ 44	$ 307
Denominator:
Shares used in basic net income per share calculation	20,465	20,117
Effect of diluted securities:
Employee stock options	1,147	1,350
Shares used in diluted net income per common share calculation	21,612	21,467
Basic net income per common share (in Dollars per share)		$ 0.02
Diluted net income per common share (in Dollars per share)		$ 0.01