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Note 5 - Related-party Transactions (Details Textual)
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Sep. 14, 2016
USD ($)
Sep. 14, 2016
BRL
Sep. 13, 2016
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
May 31, 2016
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Sep. 08, 2016
SBS [Member] | Domestic Merchandising Specialists Field Force [Member]                      
Percent Of Service Provided By Related Party               78.00% 83.00%    
SBS [Member] | Domestic Field Management [Member]                      
Percent Of Service Provided By Related Party               92.00% 90.00%    
SBS [Member] | Cost Plus Fees [Member]                      
Related Party Transaction, Rate               2.96%      
SBS [Member] | Legal Expenses Paid by Company to SBS [Member]                      
Legal Fees       $ 143,920 $ 116,635     $ 586,836 $ 383,971    
SBS [Member]                      
Number of Merchandising Specialists               6,000      
Number of National, Regional, and District Administrators               59      
Related Party Transaction, Annual Maximum Reimbursement for Settlement and Judgement Costs               $ 8      
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party       $ 143,920 $ 116,635     $ 586,836 $ 383,971    
SAS [Member] | Cost Plus Fees [Member] | Scenario, Forecast [Member]                      
Related Party Transaction, Amounts of Transaction                   $ 5  
SAS [Member] | Cost Plus Fees [Member]                      
Related Party Transaction, Rate           2.00% 4.00%        
NRS [Member] | Domestic Merchandising Specialists Field Force [Member]                      
Percent Of Service Provided By Related Party                 5.00%    
NRS [Member] | Plus2 Compensation [Member]                      
Related Party Transaction, Rate                 2.00%    
Related Party Transaction, Amounts of Transaction                 $ 20,000    
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%      
C M R Meridien [Member] | Lease Arrangement With MCPT [Member]                      
Number Of Vehicles Subleased               2      
Number Of Vehicles Leased               126      
Lessee Leasing Arrangements, Operating Leases, Term of Contract               4 years      
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%      
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%      
SPAR Todopromo [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%      
Affinity Insurance [Member] | Maximum [Member]                      
Noncontrolling Interest, Ownership Percentage by Parent       1.00%   1.00%   1.00%      
SGRP Holdings [Member] | JV Agreement [Member] | SPAR BSMT [Member]                      
Number of Directors     3                
Proceeds from Related Party Debt $ 448,000 BRL 1,400,000                  
SGRP Holdings [Member] | Loan Agreement [Member] | JKC [Member]                      
Proceeds from Related Party Debt 38,700 120,423                  
JKC [Member] | JV Agreement [Member] | SPAR BSMT [Member]                      
Number of Directors     1                
Proceeds from Related Party Debt 145,175 453,673                  
EILLC [Member] | JV Agreement [Member] | SPAR BSMT [Member]                      
Number of Directors     1                
JV Agreement [Member] | SPAR BSMT [Member]                      
Number of Directors     5                
Loan From SGRP Holdings on Behalf of EILLC [Member] | SPAR BSMT [Member]                      
Proceeds from Related Party Debt $ 37,200 BRL 116,326                  
SGRP Holdings [Member]                      
Business Acquisition, Percentage of Voting Interests Acquired                     100.00%
SGRP Holdings [Member] | SPAR BSMT Joint Venture [Member]                      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     51.00%                
JKC [Member] | SPAR BSMT Joint Venture [Member]                      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     39.00%                
EILLC [Member] | SPAR BSMT Joint Venture [Member]                      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     10.00%                
Cost of Services, Domestic Field Costs               $ 19,700,000 $ 18,900,000