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Note 13 - Net Income Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net income (loss) attributable to SPAR Group, Inc. $ 3,367 $ 2,419
Shares used in basic net income per share calculation (in shares) 21,110 20,916
Stock options and unvested restricted shares (in shares) 45 241
Shares used in diluted net income per share calculations (in shares) 21,155 21,157
Basic net income per common share: (in dollars per share) $ 0.16 $ 0.12
Diluted net income per common share: (in dollars per share) $ 0.16 $ 0.11