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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