Note 13 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net loss attributable to SPAR Group, Inc.	$ (732)	$ (1,779)
Weighted- average common shares outstanding (in shares)	22,110,000	21,266,000
Shares used in diluted net loss per share calculations (in shares)	22,109,780	21,266,264
Basic net loss per common share: (in dollars per share)	$ (0.03)	$ (0.08)
Diluted net loss per common share: (in dollars per share)	$ (0.03)	$ (0.08)