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Note 15 - Subsequent Events (Details Textual) $ in Millions | Mar. 22, 2021 USD ($) | Jan. 05, 2021 USD ($) | Apr. 10, 2019 USD ($) | May 26, 2021 | Mar. 25, 2021 USD ($) | Mar. 22, 2021 CAD ($)
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William Bartels [Member] | Loans Payable [Member] | Forecast [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.00% |  |
Subsequent Event [Member] | William Bartels [Member] | Loans Payable [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 2.00% |
Debt Instrument, Face Amount |  |  |  |  | $ 100,000 |
Revolving Credit Facility [Member] | North Mill, LLC [Member] |  |  |  |  |  |
Debt Instrument, Facility Fee for First 10.5 Million Loan Balance, Percentage |  |  | 1.50% |  |  |
Debt Instrument, Early Termination Fee, Percentage |  |  | 1.00% |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument, Facility Fee for First 10.5 Million Loan Balance, Percentage | 0.80% | 1.50% |  |  |  |
Debt Instrument, Fee Amount | $ 84,000 | $ 157,500 |  |  |  |
Debt Instrument, One Time Fee for Each Incremental 1 Million Increase in Loan Balance | $ 15,000 | $ 15,000 |  |  |  |
Debt Instrument, Early Termination Fee, Percentage | 0.85% |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.75% |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Prime Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.95% | 1.25% |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  |  |  | 5.25%
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] |  |  |  |  |  |
Debt Instrument, Covenant, Unbilled Cap |  |  | $ 4,500,000 |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] | Subsequent Event [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 16,500,000 |  |  |  |  |
Borrowing Base Availability for Unbilled Receivables, Percentage | 70.00% |  |  |  |  |
Debt Instrument, Covenant, Unbilled Cap | $ 5,500,000 |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Canada Company [Member] | Subsequent Event [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 1.5

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