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Note 9 - Commitments and Contingencies (Details Textual) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2018 USD ($) | Jun. 07, 2018 USD ($) | Dec. 08, 2015 | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Settlement and Other Charges |  |  |  |  | $ 2,000,000 |  |  |  |  | $ 1,975,000 |  |
SBS Clothier Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Number of Equal Annual Installments |  | 4 |  |  |  |  |  |  |  |  |  |
Loss Contingency, Commencement of Payments of Damages, Number of Days Following Final Settlement |  | 30 |  |  |  |  |  |  |  |  |  |
Settlement and Other Charges |  |  |  |  | 1,300,000 |  |  |  |  |  |  |
SBS Rodgers Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs |  |  | 61 |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs Not Challenged by Defendant |  |  | 11 |  |  |  |  |  |  |  |  |
SBS And SAS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties, Total |  |  |  | $ 675,000 | 675,000 |  |  | $ 675,000 |  | $ 675,000 |  |
Majority Shareholder [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  | 59.00% |  |
SPAR InfoTech, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 190,000 |  |  |  |  |  |  |  |  |  |  |
Robert G. Brown [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related-party Expenses Allowed by the Audit Committee |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Related-party Expenses Disallowed By the Audit Committee |  |  |  |  |  |  |  |  |  | 150,000 |  |
SBS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party |  |  |  |  | $ 44,000 |  | $ 93,000 | $ 104,000 | $ 179,000 | $ 105,000 | $ 218,000 |
SBS [Member] | Domestic Merchandising Specialists Field Force [Member] |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Service Provided By Related Party |  |  |  |  |  |  |  |  |  | 36.00% | 75.00% | 77.00%
Payments for Related Party Services |  |  |  |  |  |  |  |  |  | $ 15,400,000 | $ 19,600,000 | $ 25,900,000

X
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