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Note 3 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss) attributable to SPAR Group, Inc.	$ 514	$ (103)	$ 1,431	$ 193
Shares used in basic net income per share calculation (in shares)	21,262	21,108	21,225	21,107
Stock options and unvested restricted shares (in shares)	355	17	375	50
Shares used in diluted net income per share calculations (in shares)	21,617	21,125	21,600	21,157
Basic and diluted income per common share: (in dollars per share)	$ 0.02	$ 0.00	$ 0.07	$ 0.01

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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