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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended 14 Months Ended 21 Months Ended
May 09, 2018
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2019
Jan. 01, 2019
Jan. 02, 2018
Nov. 20, 2024
Sep. 30, 2021
Nov. 20, 2019
Debt Instrument [Line Items]                  
Amount outstanding       $ 42,600,000          
Unamortized debt issuance costs       1,400,000          
Letters of credit outstanding       3,200,000          
Interest expense       2,942,000 $ 4,305,000 $ 3,839,000      
Amortization of Debt Issuance Costs       474,000 607,000 465,000      
Loss on extinguishment of debt       $ 746,000 626,000 $ 0      
Minimum                  
Debt Instrument [Line Items]                  
Interest rate during period       4.24%          
Maximum                  
Debt Instrument [Line Items]                  
Interest rate during period       7.25%          
2018 Credit Subfacility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 15,000,000.0                
2018 Swingline Subfacility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 10,000,000.0                
Debt instrument, term 4 years                
Amended 2018 Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Commitment fee percentage 0.20%                
Amended 2018 Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Commitment fee percentage 0.35%                
Amended 2018 Credit Facility | LIBOR | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.00%                
Amended 2018 Credit Facility | LIBOR | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.75%                
Amended 2018 Credit Facility | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.00%                
Amended 2018 Credit Facility | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.75%                
Amended 2018 Credit Facility | Federal Funds Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 0.50%                
Amended 2018 Credit Facility | Prime Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.00%                
Revolving Credit Facility | 2018 Term Loan Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 25,000,000.0                
Revolving Credit Facility | 2018 Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 65,000,000.0                
Revolving Credit Facility | Amended 2018 Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity                 $ 75,000,000.0
Capital expenditure limit in 2020 per agreement                 37,000,000.0
Capital expenditure limit in 2021 through 2024 per agreement                 $ 45,000,000.0
Letter of Credit | Prior Credit Facility                  
Debt Instrument [Line Items]                  
Loss on extinguishment of debt         $ 600,000        
Scenario, Forecast                  
Debt Instrument [Line Items]                  
Quarterly principal payments due   $ 531,250 $ 375,000       $ 625,000 $ 187,500