Note 2 - Correction of Prior Period Financial Statements (Details Textual) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($)
Reclassification Between Comprehensive Loss Attributable to SPAR Group, Inc. and Comprehensive Loss Attributable to Non-controlling Interest [Member] \| Year Ended December 31, 2016 [Member]
Prior Period Reclassification Adjustment	$ 1.6

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