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Note 11 - Related Party Transactions (Details Textual) $ / shares in Units, R$ in Millions										1 Months Ended		3 Months Ended						6 Months Ended		8 Months Ended	9 Months Ended	12 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 ($)	Jan. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 30, 2024	Mar. 26, 2024 USD ($)	Mar. 26, 2024 BRL (R$)	Dec. 22, 2023 USD ($)
Gain (Loss) on Disposition of Business													$ (960,000)	$ (1,411,000)		$ (0)	$ (0)	$ 5,746,000	$ (0)		$ 4,786,000	$ 2,536,000	$ (408,000)
SPAR BSMT [Member]
Subsidiary, Ownership Percentage, Parent																								51.00%
Meridian [Member] \| FRIEDSHELF 401 Proprietary Limited [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner																								49.00%
SPAR 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												$ 2,200,000								2,200,000		$ 2,200,000
NMS LLC [Member]
Disposal Group, Including Discontinued Operation, Consideration																											$ 1,441,004
Proceeds from Divestiture of Businesses											$ 700,000
Financing Receivable, before Allowance for Credit Loss											523,000												523,000
Contingent Receivable											$ 209,004
Escrow Receivable																							700,000
Gain (Loss) on Disposition of Business																							(427,000)
SGRP Meridian [Member]
Disposal Group, Including Discontinued Operation, Consideration \| R									R 180,700,000
Gain (Loss) on Disposition of Business															$ 7,200,000
Proceeds from Sales of Business, Affiliate and Productive Assets					$ 7,700,000	R 144,560,000
SGRP Meridian [Member] \| Other Receivable [Member]
Disposal Group, Receivable From Sale Consideration					$ 1,900,000
SGRP Meridian [Member] \| SPAR Group [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company									51.00%
SPAR China [Member] \| SPAR Group [Member]
Gain (Loss) on Disposition of Business														(1,100,000)
Percent Of Ownership Interest In Subsidiary Sold By Company								51.00%
Proceeds From Sale of Ownership Interest								$ 200,000
Brazil Joint Venture [Member]
Disposal Group, Including Discontinued Operation, Consideration																									$ 11,800,000	R$ 58.9
Gain (Loss) on Disposition of Business														$ (1,200,000)
SPAR Japan [Member]
Disposal Group, Including Discontinued Operation, Consideration										$ 500,000
Gain (Loss) on Disposition of Business													(700,000)
SPAR Japan [Member] \| SPAR Group [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company										100.00%
Indian Joint Venture [Member]
Disposal Group, Including Discontinued Operation, Consideration		$ 500,000
Gain (Loss) on Disposition of Business													$ (1,400,000)
Indian Joint Venture [Member] \| SPAR Group [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company		51.00%
Mexican Joint Venture [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 417,000
Gain (Loss) on Disposition of Business												(1,100,000)
Mexican Joint Venture [Member] \| SPAR Group [Member]
Percent Of Ownership Interest In Subsidiary Sold By Company	51.00%
NMS [Member] \| Minimum [Member]
Percent of Reimbursement																						4.00%
NMS [Member] \| Maximum [Member]
Percent of Reimbursement																						10.00%
WB Marketing, Inc [Member] \| Service Fees [Member]
Related Party Transaction, Amounts of Transaction																						$ 104,000	$ 103,000
Resource Plus, Inc [Member]
Majority Interest Ownership Percentage By Parent																											51.00%
William Bartels [Member]
Liability, Pension and Other Postretirement and Postemployment Benefits, Current												$ 23,000								$ 23,000		23,000
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
William Bartels [Member] \| Premium Adjustments [Member]
Related Party Transaction, Amounts of Transaction																						200,000
William Bartels [Member] \| Remaining Premium Adjustments [Member]
Related Party Transaction, Amounts of Transaction																						$ 1,100,000