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8. DEBT (Details) - USD ($)
12 Months Ended
Dec. 01, 2015
Feb. 28, 2019
Jun. 15, 2018
Feb. 28, 2018
8. DEBT (Details) [Line Items]        
Long-term Debt   $ 19,776,600   $ 20,706,300
Term Loan # 2 [Member]        
8. DEBT (Details) [Line Items]        
Long-term Debt   3,312,800   3,595,100
Line of Credit [Member]        
8. DEBT (Details) [Line Items]        
Line of Credit Facility, Remaining Borrowing Capacity   12,439,300   9,424,000
Line of Credit [Member] | Term Loan # 2 [Member]        
8. DEBT (Details) [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   15,000,000    
Notes Payable to Banks [Member] | Tranche A [Member]        
8. DEBT (Details) [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 13,400,000      
Line of Credit Facility, Expiration Date Aug. 15, 2019      
Debt Instrument, Interest Rate, Stated Percentage 4.23%      
Debt Instrument, Payment Terms interest is payable monthly      
Long-term Debt   $ 11,984,100   12,453,300
Notes Payable to Banks [Member] | Tranche B [Member]        
8. DEBT (Details) [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000,000      
Line of Credit Facility, Expiration Date Dec. 01, 2025      
Debt Instrument, Payment Terms   interest payable monthly at the bank adjusted LIBOR Index plus a tiered pricing rate based on the Company’s Adjusted Funded Debt to EBITDA Ratio    
Debt Instrument, Interest Rate During Period   4.99%    
Long-term Debt   $ 4,479,700   $ 4,657,700
Notes Payable to Banks [Member] | Term Loan # 2 [Member]        
8. DEBT (Details) [Line Items]        
Debt Instrument, Face Amount   $ 4,000,000    
Debt Instrument, Maturity Date   Jun. 28, 2021    
Notes Payable to Banks [Member] | Term Loan # 1 [Member]        
8. DEBT (Details) [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 3,000,000  
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] | Term Loan # 2 [Member]        
8. DEBT (Details) [Line Items]        
Line of Credit Facility, Interest Rate at Period End   4.99%    
London Interbank Offered Rate (LIBOR) [Member] | Notes Payable to Banks [Member] | Term Loan # 2 [Member]        
8. DEBT (Details) [Line Items]        
Debt Instrument, Interest Rate During Period   4.99%