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Note 4 - Debt (Details Textual)
¥ in Millions, R 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 ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
ZAR (R)
Nov. 30, 2023
CNY (¥)
Feb. 01, 2023
CAD ($)
Dec. 31, 2022
USD ($)
Jul. 01, 2022
CAD ($)
Dec. 31, 2021
CNY (¥)
Jan. 09, 2018
USD ($)
Long-Term Debt, Current Maturities           $ 17,530,000       $ 17,980,000      
Resource Plus Acquisition Note [Member]                          
Debt Instrument, Interest Rate, Stated Percentage           1.85% 1.85%            
Debt Instrument, Face Amount                         $ 2,700,000
Long-Term Debt, Current Maturities           $ 1,100,000              
Industrial Bank and Commercial Bank of China [Member] | SPAR China [Member]                          
Debt Instrument, Face Amount | ¥               ¥ 2       ¥ 2  
Investec Bank Ltd. [Member] | SGRP Meridian [Member]                          
Debt Instrument, Interest Rate, Stated Percentage           11.75% 11.75%            
Debt Instrument, Face Amount | R             R 105            
Revolving Credit Facility [Member] | North Mill, LLC [Member]                          
Debt Related Commitment Fees and Debt Issuance Costs   $ 28,000                      
Loans Payable, Current           $ 11,900,000              
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 $ 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 $ 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    
NM Note [Member] | North Mill, LLC [Member]                          
Debt Instrument, Interest Rate, Stated Percentage           10.40% 10.40%            
Long-Term Debt           $ 12,500,000              
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           $ 600,000              
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member]                          
Debt Instrument, Fee Amount $ 200,000 $ 100,000                      
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage 0.80% 0.80%                      
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million $ 15,000 $ 15,000