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Note F - Debt Facilities (Details Textual) - USD ($)			3 Months Ended
	Mar. 29, 2018	Dec. 15, 2015	Jul. 31, 2020	Jul. 31, 2019	Apr. 30, 2020	Sep. 30, 2019	Sep. 29, 2019
Amortization of Debt Issuance Costs and Discounts, Total			$ 80,000	$ 54,000
Debt Issuance Costs, Gross			707,000		$ 787,000
Finance Lease, Liability, Total			323,000		445,000
Finance Lease, Right-of-Use Asset, Accumulated Amortization			381,000		340,000
Assets Under Finance Lease [Member]
Property, Plant and Equipment, Useful Life (Year)	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%
Long-term Debt, Total			50,000		$ 79,000
Revolving Credit Facility [Member]
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature			$ 26,000,000
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			2.85%		2.98%
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

X

- Definition

Additional borrowing capacity of line of credit facility with an accordion feature.

+ References

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

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-Name Accounting Standards Codification
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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