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Note F - Debt Facilities (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2018 | Dec. 15, 2015 | Jul. 31, 2020 | Oct. 31, 2020 | Oct. 31, 2019 | Apr. 30, 2020 | Sep. 30, 2019 | Sep. 29, 2019
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature |  |  |  | $ 27,000,000 |  |  |  |
Amortization of Debt Issuance Costs and Discounts, Total |  |  |  | 168,000 | $ 115,000 |  |  |
Payments of Debt Issuance Costs |  |  |  | 51,000 | $ 435,000 |  |  |
Debt Issuance Costs, Gross |  |  |  | 670,000 |  | $ 787,000 |  |
Finance Lease, Liability, Total |  |  |  | 202,000 |  | 445,000 |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization |  |  |  | 422,000 |  | 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 |  |  |  | $ 20,000 |  | $ 79,000 |  |
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 |

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- Definition Additional borrowing capacity of line of credit facility with an accordion feature. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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