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CREDIT FACILITIES - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 18, 2019
USD ($)
Nov. 06, 2018
USD ($)
Sep. 27, 2018
USD ($)
Sep. 18, 2018
USD ($)
Jul. 26, 2018
USD ($)
Dec. 14, 2015
Jan. 31, 2013
USD ($)
Jun. 28, 2019
USD ($)
Jun. 29, 2018
USD ($)
Jun. 28, 2019
USD ($)
Jun. 29, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jan. 18, 2013
USD ($)
Line of Credit Facility [Line Items]                          
Maximum borrowing capacity               $ 27,000,000   $ 27,000,000      
Advances from revolving credit facility                   57,343,000 $ 47,402,000    
Repayments of long-term debt               27,993,000   27,993,000   $ 17,451,000  
Credit Agreement 2013 [Member] | Term Loan B [Member]                          
Line of Credit Facility [Line Items]                          
Long-term line of credit                         $ 14,000,000
Repayment monthly installments             120 equal monthly installments            
Line of credit facility, periodic payment, principal             $ 117,000     71,000      
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid               600,000   600,000      
Face amount               6,000,000   6,000,000     $ 8,000,000
Fifth Amendment [Member] | Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member]                          
Line of Credit Facility [Line Items]                          
Basis spread on variable rate           3.25%              
Revolving Credit Facility [Member]                          
Line of Credit Facility [Line Items]                          
Maximum borrowing capacity               27,000,000.0   $ 27,000,000.0      
Maturity date                   May 05, 2022      
Repayments of long-term debt               $ 24,008,000   $ 24,008,000   12,996,000  
Maximum borrowing capacity as percentage of eligible receivables               85.00%   85.00%      
Maximum borrowing capacity based on eligible inventories               $ 14,000,000.0   $ 14,000,000.0      
Current borrowing capacity               27,000,000.0   27,000,000.0   22,000,000.0  
Line of Credit Facility, Remaining Borrowing Capacity               3,000,000   $ 3,000,000   9,000,000  
Line of Credit Facility, Average Outstanding Amount               20,000,000 $ 11,800,000        
Revolving Credit Facility [Member] | Minimum [Member]                          
Line of Credit Facility [Line Items]                          
Unused capacity, commitment fee percentage                   0.25%      
Revolving Credit Facility [Member] | Maximum [Member]                          
Line of Credit Facility [Line Items]                          
Unused capacity, commitment fee percentage                   0.375%      
Revolving Credit Facility [Member] | Credit Agreement 2013 [Member]                          
Line of Credit Facility [Line Items]                          
Average borrowing capacity               $ 27,000,000   $ 27,000,000      
Commitment fee amount                 $ 5,300   $ 16,500    
Line of Credit Facility, Covenant, Minimum Fixed Charge Coverage Ratio               1.10   1.10      
Revolving Credit Facility [Member] | Fifth Amendment [Member] | London Interbank Offered Rate (LIBOR) [Member]                          
Line of Credit Facility [Line Items]                          
Basis spread on variable rate           3.00%              
Equipment Line Advances [Member]                          
Line of Credit Facility [Line Items]                          
Maximum borrowing capacity               $ 1,500,000   $ 1,500,000      
Advances from revolving credit facility   $ 400,000   $ 300,000                  
Repayments of long-term debt               $ 0   $ 0   $ 314,000  
Equipment Line Advances Term Note [Member]                          
Line of Credit Facility [Line Items]                          
Debt Conversion, Converted Instrument, Amount $ 300,000   $ 100,000   $ 800,000                
Debt instrument, periodic payment, principal $ 9,000   $ 2,000   $ 21,000                
Term Loan B [Member]                          
Line of Credit Facility [Line Items]                          
Maturity date                   May 05, 2022