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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 ($)
Apr. 10, 2019
Jun. 30, 2021
Sep. 30, 2022
USD ($)
Sep. 30, 2022
AUD ($)
Sep. 30, 2022
CNY (¥)
Sep. 30, 2022
SAR (ر.س)
Jun. 30, 2022
Dec. 31, 2021
USD ($)
Dec. 31, 2021
AUD ($)
Dec. 21, 2021
USD ($)
Dec. 21, 2021
CNY (¥)
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%                  
Debt Instrument, Face Amount                                 $ 2,300,000    
Notes Payable, Total           $ 1,000,000.0                          
National Australia Bank [Member]                                      
Debt Instrument, Interest Rate, Effective Percentage           8.31% 8.31% 8.31% 8.31%                    
Industrial Bank and Commercial Bank of China [Member] | SPAR China [Member]                                      
Debt Instrument, Face Amount                         $ 281,000,000,000 ¥ 2          
Long-Term Debt, Total           $ 281,000,000,000   ¥ 2                      
China Construction Bank [Member]                                      
Debt Instrument, Interest Rate, Effective Percentage           4.15% 4.15% 4.15% 4.15%                    
China Construction Bank [Member] | SPAR China [Member]                                      
Debt Instrument, Face Amount           $ 141,000,000,000   ¥ 1                      
Industrial Bank [Member]                                      
Debt Instrument, Interest Rate, Effective Percentage           4.00% 4.00% 4.00% 4.00%                    
Industrial Bank [Member] | SPAR China [Member]                                      
Debt Instrument, Interest Rate, Stated Percentage           4.00% 4.00% 4.00% 4.00%                    
Debt Instrument, Face Amount           $ 422,000   ¥ 3                      
Long-Term Debt, Total           $ 422,000   ¥ 3                      
Investec Bank Ltd. [Member]                                      
Debt Instrument, Interest Rate, Effective Percentage           9.75% 9.75% 9.75% 9.75%                    
Investec Bank Ltd. [Member] | SGRP Meridian [Member]                                      
Debt Instrument, Face Amount           $ 1,700,000     ر.س 30.0                    
Long-Term Debt, Total           $ 1,000,000.0     ر.س 18.4                    
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           6.46% 6.46% 6.46% 6.46%   5.25% 5.25%              
Line of Credit, Current           $ 16,700,000         $ 9,700,000                
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 $ 17,500,000 $ 16,500,000                                  
Borrowing Base Availability for Unbilled Receivables, Percentage 80.00% 70.00%                                  
Debt Instrument, Covenant, Unbilled Cap $ 6,500,000 $ 5,500,000 $ 4,500,000                                
Borrowing Base Availability for Billed Receivables, Percentage 90.00% 85.00%                                  
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, Current                                   $ 517,000 $ 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           $ 113,000 $ 174,000       $ 118,000 $ 164,000