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Note 8 - Related Party Transactions (Details Textual) $ / shares in Units, R$ in Millions										1 Months Ended	3 Months Ended					6 Months Ended		12 Months Ended	14 Months Ended
	Dec. 19, 2024 USD ($)	Sep. 25, 2024 USD ($)	May 03, 2024 $ / shares shares	Apr. 30, 2024 shares	Apr. 29, 2024 USD ($) $ / shares	Apr. 29, 2024 ZAR (R)	Apr. 18, 2024 USD ($)	Feb. 23, 2024 USD ($)	Feb. 07, 2024 ZAR (R)	Aug. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Mar. 26, 2024 USD ($)	Mar. 26, 2024 BRL (R$)
Gain (Loss) on Disposition of Business											$ (0)			$ (1,411,000)		$ (0)	$ 5,746,000
SGRP Meridian [Member]
Disposal Group, Including Discontinued Operation, Consideration | R									R 180,700,000
Proceeds from Sales of Business, Affiliate and Productive Assets					$ 7,700,000	R 144,560,000
Gain (Loss) on Disposition of Business															$ 7,200,000
SGRP Meridian [Member] | Other Receivable [Member]
Disposal Group, Receivable From Sale Consideration					$ 1,900,000
Brazil Joint Venture [Member]
Disposal Group, Including Discontinued Operation, Consideration																				$ 11,800,000	R$ 58.9
Gain (Loss) on Disposition of Business											(1,188,000)			(1,200,000)		(1,188,000)
SPAR Japan [Member]
Disposal Group, Including Discontinued Operation, Consideration										$ 500,000
Gain (Loss) on Disposition of Business													$ (700,000)
Indian Joint Venture [Member]
Disposal Group, Including Discontinued Operation, Consideration		$ 500,000
Gain (Loss) on Disposition of Business													$ (1,400,000)
Mexican Joint Venture [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 417,000
Gain (Loss) on Disposition of Business												$ (1,100,000)
SPAR BSMT [Member]
Subsidiary, Ownership Percentage, Parent															51.00%
Meridian [Member] | FRIEDSHELF 401 Proprietary Limited [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner															49.00%
SPAR Group [Member] | SGRP Meridian [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company									51.00%
SPAR Group [Member] | SPAR China [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company								51.00%
Gain (Loss) on Disposition of Business														(1,100,000)
Proceeds From Sale of Ownership Interest								$ 200,000
SPAR Group [Member] | SPAR Japan [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company										100.00%
SPAR Group [Member] | Indian Joint Venture [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company		51.00%
SPAR Group [Member] | Mexican Joint Venture [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company	51.00%
SPAR Marketing Force [Member]
Subsidiary, Ownership Percentage, Parent																				51.00%	51.00%
Resource Plus, Inc [Member]
Payments to Acquire Interest in Joint Venture							$ 3,000,000
Resource Plus Acquisition Note [Member]
Payments to Acquire Interest in Joint Venture							250,000												$ 500,000
Debt Instrument, Face Amount							$ 2,750,000
Long-Term Debt, Gross											2,300,000					2,300,000			2,300,000
William Bartels [Member]
Liability, Pension and Other Postretirement and Postemployment Benefits, Current											0					0			$ 0
William Bartels [Member] | The 2024 Stock Repurchase Program [Member]
Treasury Stock, Shares, Acquired (in shares) | shares			1,000,000	1,000,000
Share Price (in dollars per share) | $ / shares			$ 1.8		$ 1.8
Premium Adjustments [Member] | William Bartels [Member]
Related Party Transaction, Amounts of Transaction																		$ 200,000
Remaining Premium Adjustments [Member] | William Bartels [Member]
Related Party Transaction, Amounts of Transaction																		$ 1,100,000
Service Fees [Member] | WB Marketing, Inc [Member]
Related Party Transaction, Amounts of Transaction											$ 41,000			$ 170,000		$ 15,000	$ 87,000

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