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Note F - Debt Facilities (Details Textual) - USD ($)
9 Months Ended
Mar. 29, 2018
Dec. 15, 2015
Jan. 31, 2020
Jan. 31, 2019
Sep. 30, 2019
Sep. 29, 2019
Apr. 30, 2019
Amortization of Debt Issuance Costs and Discounts, Total     $ 191,000 $ 198,000      
Debt Related Commitment Fees and Debt Issuance Costs     458,000 $ 372,000      
Debt Issuance Costs, Gross     823,000       $ 555,000
Long-term Debt, Total     109,000       194,000
Capital Lease Obligations, Total     550,000       839,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation     298,000       $ 177,000
Assets Held under Capital Leases [Member]              
Property, Plant and Equipment, Useful Life 3 years            
Note Payable Related to the Property Purchase Agreement [Member]              
Debt Instrument, Face Amount   $ 550,000          
Debt Instrument, Periodic Payment, Total   $ 10,005          
Debt Instrument, Interest Rate, Stated Percentage   3.50%          
Revolving Credit Facility [Member]              
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature     56,000,000        
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases     $ 50,000,000        
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases     20.00%        
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income     75.00%        
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available     12.50%        
Revolving Credit Facility [Member] | BMO Harris Bank [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         $ 241,000,000 $ 215,000,000  
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature         100,000,000 50,000,000  
Debt Instrument, Interest Rate, Effective Percentage     4.00%       4.73%
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.35%        
Colonial Revolving Credit Facility [Member] | BMO Harris Bank [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         231,000,000 $ 205,000,000  
ACM TCM Revolving Credit Facility [Member] | BMO Harris Bank [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         $ 10,000,000