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Note 4 - Credit Facilities and Other Debt (Details Textual)
¥ in Millions, $ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 22, 2021
USD ($)
Jan. 05, 2021
USD ($)
Apr. 10, 2019
USD ($)
Jan. 09, 2018
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
MXN ($)
Mar. 31, 2021
AUD ($)
Mar. 31, 2021
CNY (¥)
Mar. 22, 2021
CAD ($)
Jan. 05, 2021
CAD ($)
Oct. 31, 2017
AUD ($)
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         6.00%     6.00% 6.00% 6.00%      
Industrial Bank [Member] | SPAR China [Member]                          
Debt Instrument, Interest Rate, Stated Percentage         6.00%     6.00% 6.00% 6.00%      
Debt Instrument, Face Amount         $ 460,000         ¥ 3      
Long-term Debt, Total         $ 460,000         ¥ 3      
CCB Bank [Member]                          
Debt Instrument, Interest Rate, Effective Percentage         6.00%     6.00% 6.00% 6.00%      
CCB Bank [Member] | SPAR China [Member]                          
Debt Instrument, Interest Rate, Stated Percentage         6.00%     6.00% 6.00% 6.00%      
Debt Instrument, Face Amount         $ 153,000         ¥ 1      
Long-term Debt, Total         $ 153,000         ¥ 1      
Ve Por Mas [Member]                          
Debt Instrument, Interest Rate, Effective Percentage         7.30%     7.30% 7.30% 7.30%      
Revolving Credit Facility [Member] | North Mill, LLC [Member]                          
Debt Instrument, Facility Fee for First 10.5 Million Loan Balance, Percentage 0.80% 1.50% 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 1.00%   0.85%                    
Debt Instrument, Interest Rate, Effective Percentage         6.75%     6.75% 6.75% 6.75%      
Line of Credit, Current         $ 11,800,000                
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Prime Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate 0.95% 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                    
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)     1 year 180 days                    
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] | 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] | 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         3.60%     3.60% 3.60% 3.60%      
Debt Covenant, Minimum Fixed Charge Ratio       1.2                  
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         $ 608,659               $ 800,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability                         80.00%
Long-term Line of Credit, Total         9,188       $ 12,076        
Revolving Credit Facility [Member] | Ve Por Mas [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity         390,096     $ 8          
Long-term Line of Credit, Total         $ 0                
Line of Credit Facility, Interest Rate at Period End         7.30%     7.30% 7.30% 7.30%      
Revolving Credit Facility [Member] | Ve Por Mas [Member] | Interbank Interest Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate         3.00%                
Revolving Credit Facility [Member] | BBVA Bancormer [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity         $ 243,810     $ 5          
Long-term Line of Credit, Total         $ 243,810     $ 5          
Line of Credit Facility, Interest Rate at Period End         9.60%     9.60% 9.60% 9.60%      
Revolving Credit Facility [Member] | BBVA Bancormer [Member] | Interbank Interest Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate         5.20%