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CREDIT FACILITIES - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 08, 2019
May 06, 2019
Mar. 18, 2019
Jan. 31, 2013
Sep. 30, 2020
Sep. 30, 2019
Jun. 04, 2020
Jul. 07, 2019
Jan. 18, 2013
Debt Instrument [Line Items]                  
Long-term line of credit     $ 14,000,000.0            
Available borrowing capacity         $ 19,400,000 $ 8,400,000      
Long-term debt         21,476,000 $ 30,281,000      
Credit Agreement 2013 | Term Loan B                  
Debt Instrument [Line Items]                  
Long-term line of credit $ 6,000,000.0             $ 8,000,000.0 $ 14,000,000.0
Repayment monthly installments       120 equal monthly installments          
Line of credit facility, periodic payment, principal 71,000     $ 117,000          
Interest rate, effective percentage           2.50%      
Balloon payment $ 600,000                
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         $ 45,000,000.0 $ 35,000,000.0      
Interest rate, stated percentage         2.75% 4.31%      
Maturity date         Jun. 04, 2023        
Maximum borrowing capacity as percent of eligible receivables         85.00%        
Maximum borrowing capacity based on eligible inventory         $ 30,000,000.0 $ 30,000,000.0      
Current borrowing capacity         39,400,000 35,000,000.0      
Average borrowing capacity         24,400,000 $ 21,400,000      
Commitment fee amount         $ 45,000,000.0        
Interest rate, effective percentage         1.75% 2.25%      
Revolving Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Unused capacity, commitment fee percentage         0.25%        
Revolving Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Unused capacity, commitment fee percentage         0.375%        
Revolving Credit Facility | Credit Agreement 2013                  
Debt Instrument [Line Items]                  
Commitment fee amount         $ 32,000 $ 20,000      
Master Lease                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         10,000,000.0   $ 10,000,000.0    
Long-term line of credit         1,800,000        
Equipment Line Advances [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity             45,000,000.0    
Minimum Increase amounts allowed             5,000,000.0    
Maximum borrowing capacity allowed after provisional increments             $ 55,000,000.0    
Payment of fees         $ 84,000        
Equipment Line Advances [Member] | Minimum                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage             1.00%    
Term Loan B                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage         0.00% 4.59%      
Maturity date         May 05, 2022        
Equipment Line Advances Term Note [Member]                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage         0.00% 4.56%      
Long-term line of credit   $ 400,000 300,000            
Line of credit facility, periodic payment, principal   $ 11,000 $ 9,000            
Long-term debt           $ 1,125,000