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Note 3 - Debt (Details Textual)
ر.س in Millions, ¥ in Millions, $ in Millions, $ in Millions
5 Months Ended
Oct. 10, 2023
USD ($)
Feb. 01, 2023
USD ($)
Jul. 01, 2022
USD ($)
Mar. 22, 2021
USD ($)
Jun. 30, 2023
USD ($)
Feb. 01, 2023
CAD ($)
Dec. 31, 2022
SAR (ر.س)
Jul. 01, 2022
CAD ($)
Mar. 31, 2022
SAR (ر.س)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Jan. 09, 2018
USD ($)
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         $ 700,000                
Industrial Bank [Member] | SPAR China [Member]                          
Debt Instrument, Interest Rate, Stated Percentage         4.00%                
Long-Term Debt         $ 400,000                
Debt Instrument, Face Amount | ¥                     ¥ 3    
Industrial Bank and Commercial Bank of China [Member] | SPAR China [Member]                          
Debt Instrument, Interest Rate, Stated Percentage         4.15%                
Long-Term Debt         $ 300,000                
Debt Instrument, Face Amount | ¥                   ¥ 2      
Investec Bank Ltd. [Member] | SGRP Meridian [Member]                          
Debt Instrument, Interest Rate, Stated Percentage         11.75%                
Long-Term Debt         $ 3,600,000                
Debt Instrument, Face Amount | ر.س             ر.س 25.0   ر.س 100.5        
Revolving Credit Facility [Member] | North Mill, LLC [Member]                          
Debt Related Commitment Fees and Debt Issuance Costs   $ 28,000                      
Long-Term Debt         10,800,000                
Revolving Credit Facility [Member] | North Mill, LLC [Member] | CANADA                          
Debt Related Commitment Fees and Debt Issuance Costs         $ 3,000                
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity   28,000,000.0 $ 17,500,000     $ 2.0              
Borrowing Base Availability for Billed Receivables, Percentage     90.00% 85.00%                  
Borrowing Base Availability for Unbilled Receivables, Percentage     80.00% 70.00%                  
Debt Instrument, Covenant, Unbilled Cap   $ 7,000,000.0 $ 6,500,000 $ 5,500,000                  
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] | National Australia Bank [Member]                          
Line of Credit, Current                         $ 0.8
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability                         80.00%
Line of Credit Facility, Interest Rate at Period End         12.10%                
Long-Term Line of Credit, Total         $ 100,000                
NM Note [Member] | North Mill, LLC [Member]                          
Debt Instrument, Interest Rate, Stated Percentage         10.15%                
Long-Term Debt         $ 11,900,000                
NM Note [Member] | North Mill, LLC [Member] | Minimum [Member]                          
Debt Instrument, Basis Spread on Variable Rate   6.75%                      
NM Note [Member] | North Mill, LLC [Member] | Prime Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate   1.90%                      
NM Note [Member] | North Mill, LLC [Member] | SPAR Canada Company [Member]                          
Long-Term Debt         $ 1,100,000                
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member]                          
Debt Instrument, Fee Amount   $ 100,000                      
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage   0.80%                      
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million   $ 15,000                      
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member] | Forecast [Member]                          
Debt Instrument, Fee Amount $ 200,000                        
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage 0.80%                        
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million $ 15,000