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Note 6 - Commitments and Contingencies (Details Textual)
3 Months Ended 7 Months Ended 11 Months Ended 12 Months Ended
Mar. 18, 2019
USD ($)
Sep. 18, 2018
USD ($)
Jun. 07, 2018
USD ($)
Dec. 08, 2015
Jun. 30, 2018
USD ($)
Jul. 31, 2018
USD ($)
Jul. 27, 2018
USD ($)
Nov. 23, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Operating Leases, Rent Expense, Total                 $ 2,211,000 $ 1,806,000
SPAR InfoTech, Inc. [Member] | Alleged Lost Tax Benefits and Other Expenses [Member]                    
Loss Contingency, Damages Sought, Value   $ 190,000                
SPAR InfoTech, Inc. [Member] | Allegedly Owed Programming Services [Member]                    
Loss Contingency, Damages Sought, Value   900,000                
Robert G. Brown [Member]                    
Related-party Expenses Allowed by the Audit Committee   50,000                
Related-party Expenses Disallowed By the Audit Committee   150,000                
Estimated Litigation Liability   75,000                
Robert G. Brown [Member] | Minimum [Member]                    
Estimated Litigation Liability   75,000                
Robert G. Brown [Member] | Maximum [Member]                    
Estimated Litigation Liability   $ 90,000                
SBS [Member]                    
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party           $ 260,000,000,000   $ 50,000   $ 260,000
SBS [Member] | Domestic Merchandising Specialists Field Force [Member]                    
Percent Of Service Provided By Related Party             27.00%     77.00%
Payments for Related Party Services             $ 15,400,000     $ 25,900,000
Reimbursement for SMF's funding of the Affinity Security Deposits [Member] | Subsequent Event [Member]                    
Loss Contingency, Damages Sought, Value $ 378,838                  
Reimbursement for SMF's Funding of the Field Payment Checks [Member] | Subsequent Event [Member]                    
Loss Contingency, Damages Sought, Value 12,963                  
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 Clothier Litigation [Member] | Subsequent Event [Member]                    
Loss Contingency, Damages Sought, Value $ 1,839,459                  
SBS Rodgers Litigation [Member]                    
Loss Contingency, Number of Plaintiffs       6            
Hogan Case [Member]                    
Estimated Litigation Liability                 250,000  
Loss Contingency, Estimate of Possible Loss                 250,000  
Equipment [Member]                    
Operating Leases, Rent Expense, Total                 $ 167,000 $ 163,000