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Note 15 - Subsequent Events (Details Textual) - North Mill, LLC [Member] | Oct. 10, 2023 USD ($) | Feb. 01, 2023 USD ($) | Feb. 01, 2023 CAD ($) | Jan. 31, 2023 USD ($) | Jan. 31, 2023 CAD ($) | Jul. 01, 2022 USD ($) | Jul. 01, 2022 CAD ($) | Mar. 22, 2021 USD ($) | Mar. 22, 2021 CAD ($) | Jan. 05, 2021 USD ($)
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Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  | $ 28,000 |  |  |  |  |  |  |  |
Long-Term Debt, Total |  |  |  | $ 12,967,000 |  |  |  |  |  |
Revolving Credit Facility [Member] | SPAR Marketing Force [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 17,500,000 |  | $ 16,500,000 |  |
Debt Instrument, Covenant, Unbilled Cap |  |  |  |  |  | $ 6,500,000 |  | $ 5,500,000 |  | $ 4,500,000
Revolving Credit Facility [Member] | SPAR Marketing Force [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 28,000,000 | $ 2,000,000 |  |  |  |  |  |  |
Debt Instrument, Covenant, Unbilled Cap |  | 7,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | SPAR Canada Company [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 1,500,000 |  | $ 1,500,000 |
Restated US Note [Member] | SPAR Marketing Force [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 28,000,000 | $ 2,000,000 |  |  |  |  |  |  |
NM Note [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.45% | 8.45% |  |  |  |  |
Long-Term Debt, Total |  |  |  | $ 13,500,000 |  |  |  |  |  |
NM Note [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 6.75% |  |  |  |  |  |  |  |
NM Note [Member] | Subsequent Event [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.90% |  |  |  |  |  |  |  |
NM Note [Member] | SPAR Canada Company [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Total |  |  |  | $ 561,000 | $ 752,000 |  |  |  |  |
Foreign Currency Exchange Rate, Remeasurement |  |  |  | 1.3413 | 1.3413 |  |  |  |  |
NM Notes Commencing on 10 October 2022 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount | $ 168,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage | 0.80% |  |  |  |  |  |  |  |  |
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million | $ 15,000 |  |  |  |  |  |  |  |  |
NM Notes Commencing on 10 October 2022 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  | $ 140,000 |  |  |  |  |  |  |  |
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage |  | 0.80% |  |  |  |  |  |  |  |
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million |  | $ 15,000 |  |  |  |  |  |  |  |

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