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Note 4 - Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 16, 2021
Jul. 23, 2021
Jul. 13, 2021
Aug. 16, 2020
Apr. 16, 2020
Nov. 02, 2018
Sep. 30, 2021
Senior Unsecured Notes Offering              
Debt              
Aggregate principal amount     $ 34,500        
Amount of note offering costs     $ 2,400        
Long-term Debt, Total             $ 34,500
Interest rate     9.00%        
KeyBank National Association | Revolving Credit Facility              
Debt              
Line of Credit Facility, Maximum Borrowing Capacity           $ 30,000  
Amount of remaining availability             27,100
Outstanding on Revolving Credit Facility             0
KeyBank National Association | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)              
Debt              
Debt Instrument, Basis Spread on Variable Rate           2.00%  
KeyBank National Association | Revolving Credit Facility | Base Rate              
Debt              
Debt Instrument, Basis Spread on Variable Rate           1.50%  
KeyBank National Association | Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate              
Debt              
Debt Instrument, Basis Spread on Variable Rate           0.50%  
KeyBank National Association | Letter of Credit              
Debt              
Line of Credit Facility, Maximum Borrowing Capacity           $ 3,000  
KeyBank National Association | Term Loan              
Debt              
Aggregate principal amount           $ 10,000  
Amount of monthly installments             278
Long-term Debt, Total             $ 4,200
KeyBank National Association | Term Loan | London Interbank Offered Rate (LIBOR)              
Debt              
Debt Instrument, Basis Spread on Variable Rate             5.15%
KeyBank National Association | Equipment Loan              
Debt              
Aggregate principal amount         $ 4,700    
Amount of monthly installments         $ 147    
Outstanding on Revolving Credit Facility             $ 2,600
Number Of Monthly Installments       36 months      
Annual percent of premium prepayment         3.00%    
Annual premium decline in premium prepayment         1.00%    
Interest rate         7.45%    
J. H. Fletcher & Co              
Debt              
Long-term Debt, Total             $ 800
J. H. Fletcher & Co | Equipment Loan              
Debt              
Aggregate principal amount   $ 1,000          
Amount of monthly installments   $ 40          
Number Of Monthly Installments   24 months          
Interest rate   0.00%          
Komatsu Financial Limited Partnership              
Debt              
Aggregate principal amount $ 1,000            
Amount of monthly installments 36            
Amount of monthly installments until maturity 28            
Long-term Debt, Total $ 1,000            
Number Of Monthly Installments 36 months            
Interest rate 4.60%