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Note 4 - Credit Facilities (Details Textual)
¥ in Millions, $ in Millions, $ in Millions
6 Months Ended
Mar. 22, 2021
USD ($)
Jan. 05, 2021
USD ($)
Apr. 10, 2019
USD ($)
Jan. 09, 2018
USD ($)
Dec. 31, 2021
Jun. 30, 2021
Mar. 22, 2021
CAD ($)
Jan. 05, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2020
CNY (¥)
Oct. 05, 2018
BRL (R$)
Oct. 31, 2017
AUD ($)
Debt Instrument, Interest Rate, Effective Percentage                    
Resource Plus, Inc [Member]                            
Business Acquisition, Percentage of Voting Interests Acquired       51.00%                    
Restated US Note [Member] | Subsequent Event [Member] | SPAR Marketing Force [Member]                            
Debt Instrument, Face Amount   $ 14,500,000                        
Restated US Note [Member] | Subsequent Event [Member] | SPAR Canada Company [Member]                            
Debt Instrument, Face Amount               $ 1.5            
Resource Plus Acquisition Note [Member]                            
Debt Instrument, Face Amount       $ 2,300,000                    
Notes Payable, Total                 $ 1,300,000          
North Mill, LLC [Member]                            
Debt Instrument, Interest Rate, Effective Percentage                 6.75% 6.75% 6.75% 6.75%    
Fifth Third Bank [Member]                            
Debt Instrument, Interest Rate, Effective Percentage                 3.60% 3.60% 3.60% 3.60%    
National Australia Bank [Member]                            
Debt Instrument, Interest Rate, Effective Percentage                 6.56% 6.56% 6.56% 6.56%    
Industrial Bank [Member]                            
Debt Instrument, Interest Rate, Effective Percentage                 4.65% 4.65% 4.65% 4.65%    
Industrial Bank [Member] | SPAR China [Member]                            
Debt Instrument, Face Amount                 $ 460,000     ¥ 3    
Debt Instrument, Interest Rate, Stated Percentage                 4.65% 4.65% 4.65% 4.65%    
Long-term Debt, Total                 $ 460,000     ¥ 3    
CCB Bank [Member]                            
Debt Instrument, Interest Rate, Effective Percentage                 4.25% 4.25% 4.25% 4.25%    
CCB Bank [Member] | SPAR China [Member]                            
Debt Instrument, Face Amount                 $ 153,000     ¥ 1    
Debt Instrument, Interest Rate, Stated Percentage                 4.25% 4.25% 4.25% 4.25%    
Long-term Debt, Total                 $ 153,000     ¥ 1    
Revolving Credit Facility [Member] | North Mill, LLC [Member]                            
Debt Instrument, Facility Fee for First 10.5 Million Loan Balance, Percentage     1.50%                      
Debt Instrument, Interest Rate, Effective Percentage                 6.75% 6.75% 6.75% 6.75%    
Line of Credit, Current                 $ 8,300,000          
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member]                            
Debt Instrument, Covenant, Unbilled Cap     $ 4,500,000                      
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member]                            
Debt Instrument, Facility Fee for First 10.5 Million Loan Balance, Percentage 0.80% 1.50%                        
Debt Instrument, Fee Amount $ 84,000 $ 157,500                        
Debt Instrument, One Time Fee for Each Incremental 1 Million Increase in Loan Balance $ 15,000 15,000                        
Payments for Debt Instrument Modification Fee   $ 7,500                        
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 0.95% 1.25%                        
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Minimum [Member]                            
Debt Instrument, Interest Rate, Stated Percentage   6.75%           6.75%            
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Minimum [Member] | Prime Rate [Member]                            
Debt Instrument, Interest Rate, Stated Percentage 5.25%           5.25%              
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | SPAR Marketing Force [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity $ 16,500,000                          
Borrowing Base Availability for Unbilled Receivables, Percentage 70.00%                          
Debt Instrument, Covenant, Unbilled Cap $ 5,500,000                          
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | SPAR Canada Company [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity             $ 1.5              
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member]                            
Debt Instrument, Term (Month)     1 year 180 days                      
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Marketing Force [Member] | Forecast [Member]                            
Borrowing Base Availability for Unbilled Receivables, Percentage         65.00%                  
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Marketing Force [Member] | Forecast [Member] | Maximum [Member]                            
Borrowing Base Availability for Unbilled Receivables, Percentage           70.00%                
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | Subsequent Event [Member] | SPAR Marketing Force [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity   $ 14,500,000                        
Debt Instrument, Covenant, Unbilled Cap   4,500,000                        
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | Subsequent Event [Member] | SPAR Canada Company [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity               $ 1.5            
Debt Instrument, Covenant, Unbilled Cap   $ 3,900,000                        
Revolving Credit Facility [Member] | Fifth Third Bank [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity       $ 3,500,000                    
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability       80.00%                    
Long-term Line of Credit, Total                 $ 0          
Line of Credit Facility, Interest Rate at Period End                 5.20% 5.20% 5.20% 5.20%    
Revolving Credit Facility [Member] | Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate       2.50%                    
Revolving Credit Facility [Member] | National Australia Bank [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity                 $ 617,000         $ 800,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability                           80.00%
Long-term Line of Credit, Total                 154,000   $ 200,000      
Revolving Credit Facility [Member] | Banco Santander [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity                 73,000       R$ 381,000  
Revolving Credit Facility [Member] | Steel Factoring [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity                 $ 262,000 $ 5        
Debt Instrument, Interest Rate, Effective Percentage                 8.00% 8.00% 8.00% 8.00%    
Long-term Line of Credit, Total                 $ 0