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Note 5 - Credit Facilities and Other Debt (Details Textual)
ر.س in Millions, ¥ in Millions, $ in Millions
6 Months Ended
Jul. 01, 2022
USD ($)
Mar. 22, 2021
USD ($)
Jan. 05, 2021
USD ($)
Apr. 10, 2019
Jun. 30, 2021
Jun. 30, 2022
USD ($)
Jun. 30, 2022
CNY (¥)
Jun. 30, 2022
SAR (ر.س)
Dec. 21, 2021
USD ($)
Dec. 21, 2021
CNY (¥)
Jul. 13, 2021
USD ($)
Jul. 13, 2021
SAR (ر.س)
Mar. 22, 2021
CAD ($)
Jan. 05, 2021
CAD ($)
Jan. 09, 2018
USD ($)
Oct. 31, 2017
USD ($)
Oct. 31, 2017
AUD ($)
Resource Plus Acquisition Note [Member]                                  
Debt Instrument, Interest Rate, Stated Percentage           1.85% 1.85% 1.85%                  
Debt Instrument, Face Amount                             $ 2,300,000    
Notes Payable, Total           $ 1,000,000.0                      
North Mill, LLC [Member]                                  
Debt Instrument, Interest Rate, Effective Percentage           5.25% 5.25% 5.25%                  
National Australia Bank [Member]                                  
Debt Instrument, Interest Rate, Effective Percentage           8.31% 8.31% 8.31%                  
Industrial Bank and Commercial Bank of China [Member]                                  
Debt Instrument, Interest Rate, Effective Percentage           4.15% 4.15% 4.15%                  
Industrial Bank and Commercial Bank of China [Member] | SPAR China [Member]                                  
Debt Instrument, Face Amount                 $ 299,000 ¥ 2              
Long-Term Debt, Total           $ 299,000 ¥ 2                    
China Construction Bank [Member] | SPAR China [Member]                                  
Debt Instrument, Face Amount           $ 149,000 ¥ 1                    
Industrial Bank [Member]                                  
Debt Instrument, Interest Rate, Effective Percentage           4.00% 4.00% 4.00%                  
Industrial Bank [Member] | SPAR China [Member]                                  
Debt Instrument, Interest Rate, Stated Percentage           4.00% 4.00% 4.00%                  
Debt Instrument, Face Amount           $ 448,000 ¥ 3                    
Long-Term Debt, Total           $ 448,000 ¥ 3                    
Investec Bank Ltd. [Member]                                  
Debt Instrument, Interest Rate, Effective Percentage           7.75% 7.75% 7.75%                  
Investec Bank Ltd. [Member] | SGRP Meridian [Member]                                  
Debt Instrument, Face Amount                     $ 1,800,000 ر.س 30          
Long-Term Debt, Total           $ 1,800,000   ر.س 30                  
Revolving Credit Facility [Member] | North Mill, LLC [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                            
Debt Instrument, Early Termination Fee, Percentage   0.85%   1.00%                          
Debt Instrument, Interest Rate, Effective Percentage           5.25% 5.25% 5.25%                  
Line of Credit, Current           $ 15,500,000                      
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Prime Rate [Member]                                  
Debt Instrument, Basis Spread on Variable Rate     1.25%                            
Debt Instrument, Interest Rate, Stated Percentage   1.25%                     1.25%        
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Minimum [Member]                                  
Debt Instrument, Interest Rate, Stated Percentage   5.25% 6.75%                   5.25% 6.75%      
Revolving Credit Facility [Member] | North Mill, LLC [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 $ 4,500,000                            
Borrowing Base Availability for Billed Receivables, Percentage   85.00%                              
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] | Subsequent Event [Member]                                  
Line of Credit Facility, Maximum Borrowing Capacity $ 17,500,000                                
Borrowing Base Availability for Unbilled Receivables, Percentage 80.00%                                
Debt Instrument, Covenant, Unbilled Cap $ 6,500,000                                
Borrowing Base Availability for Billed Receivables, Percentage 90.00%                                
Line of Credit Facility, Availability Reserve Against US Advance Limit $ 500,000                                
Revolving Credit Facility [Member] | North Mill, LLC [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)       18 months                          
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [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] | SPAR Marketing Force [Member] | Maximum [Member]                                  
Borrowing Base Availability for Unbilled Receivables, Percentage         70.00%                        
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [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] | National Australia Bank [Member]                                  
Line of Credit Facility, Maximum Borrowing Capacity                               $ 551,000 $ 800,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability                               80.00% 80.00%
Long-Term Line of Credit, Total                               $ 92,000 $ 132,000