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Note 6 - Related-party Transactions (Details Textual) |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 23, 2018 USD ($) | Sep. 08, 2016 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 31, 2016 | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Aug. 31, 2018 USD ($)
Related Party Transaction, Expenses from Transactions with Related Party |  |  | $ 3,000,000 |  | $ 8,631,000 |  |  |  |  |  |  | $ 19,406,000 | $ 24,111,000 |  |
Payments for Cash Collateral Deposits |  |  |  |  |  |  |  |  |  |  |  | $ 965,000 |  |  |
Merhold Property Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Vehicles Subleased |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Number Of Vehicles Leased |  |  |  |  |  |  |  |  |  |  |  | 172 |  |  |
Lessee, Operating Lease, Term of Contract |  |  | 4 years |  |  |  |  | 4 years |  |  |  | 4 years |  |  |
SBS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Merchandising Specialists |  |  |  |  |  |  |  |  |  |  |  | 3,900 | 3,900 |  |
Number of National, Regional, and District Administrators |  |  |  |  |  |  |  |  |  |  |  | 54 | 60 |  |
Withheld Final Mark-up Compensation Due to Related Party | $ 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Funding for Field Specialist Payments |  |  |  |  |  |  |  |  |  |  |  | $ 11,000 |  |  |
Estimated Additional Field Specialist Payments | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party |  |  |  | $ 44,000 |  | $ 93,000 |  |  | $ 104,000 | $ 179,000 |  | 105,000 | $ 218,000 |  |
Payments for Cash Collateral Deposits, Allocated to Related Party |  |  |  |  |  |  |  |  |  |  |  | 379,000 |  |  |
SBS [Member] | Post-termination Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | $ 105,000 |  |  |  |  | $ 105,000 |  |  |  | 105,000 |  |  | $ 120,000
SBS [Member] | Domestic Merchandising Specialists Field Force [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Related Party Services |  |  |  |  |  |  |  |  |  |  |  | $ 15,400,000 | $ 19,600,000 | $ 25,900,000 |
Percent Of Service Provided By Related Party |  |  |  |  |  |  |  |  |  |  |  | 36.00% | 75.00% | 77.00% |
SBS [Member] | Domestic Field Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Related Party Services |  |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 | $ 3,200,000 |  |
Percent Of Service Provided By Related Party |  |  |  |  |  |  |  |  |  |  |  | 68.00% | 90.00% |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  |  |  |  |  | $ 18,200,000 | $ 22,800,000 |  |
SBS [Member] | Cost Plus Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Rate |  |  |  |  |  |  | 4.00% |  |  |  | 2.00% | 2.96% |  |  |
SAS [Member] | Post-termination Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | $ 42,000 |  |  |  |  | $ 42,000 |  |  |  | $ 42,000 |  |  | $ 45,000
NRS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% |  |  |  |  | 51.00% |  |  |  | 51.00% |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
Resource Plus, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% |  |  |  |  | 51.00% |  |  |  | 51.00% |  |  |
Mr. Justus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
C M R Meridien [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% |  |  |  |  | 51.00% |  |  |  | 51.00% |  |  |
Mr. Brian Mason Mr. Garry Bristow And Mr. Adrian Wingfield [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
Mr. Mason [Member] | Merhold Property Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Mr. Mason [Member] | Merhold Holding Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 46.70% |  |  |
Mr. Mason and Mr. Bristow [Member] | Merhold Cape Property Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Mr. Bristow [Member] | Merhold Holding Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Mr. Wingfield [Member] | Merhold Holding Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 33.30% |  |  |
NDS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% |  |  |  |  | 51.00% |  |  |  | 51.00% |  |  |
Mr And Ms Yilmaz [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
Mr. Juan F. Medina Domenzain [Member] | CON [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |
SMF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Cash Collateral Deposits, Allocated to Related Party |  |  |  |  |  |  |  |  |  |  |  | $ 296,000 |  |  |
All Others [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Cash Collateral Deposits, Allocated to Related Party |  |  |  |  |  |  |  |  |  |  |  | 290,000 |  |  |
SAS, SBS, and SMF [Member] | Affinity Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Reimbursement on Advances |  |  |  |  |  |  |  |  |  |  |  | $ 675,000 |  |  |
Robert G. Brown and William H. Bartels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 59.00% |  |  |
SBS And SAS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties, Total |  |  | $ 675,000 | 675,000 |  |  |  | $ 675,000 | $ 675,000 |  |  | $ 675,000 |  |  |
Reserve for Related-party Receivables, Amount Recorded During Period |  |  |  | $ 675,000 |  |  |  | $ 675,000 |  |  |  |  |  |  |
SPAR InfoTech, Inc. [Member] | Assistance Provided in Connection to Brazilian Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 49,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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