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Note F - Debt Facilities (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2018 | Dec. 15, 2015 | Mar. 31, 2020 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018 | Sep. 30, 2019 | Sep. 29, 2019 | Apr. 30, 2017
Proceeds from Lines of Credit, Total |  |  |  | $ 442,490,000 | $ 450,554,000 | $ 433,818,000 |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |  |  | 59,560,000 | 1,752,000 | 1,022,000 |  |  | $ 434,000
Amortization of Debt Issuance Costs and Discounts, Total |  |  |  | 273,000 | 251,000 | $ 260,000 |  |  |
Debt Related Commitment Fees and Debt Issuance Costs |  |  |  | 505,000 | 371,000 |  |  |  |
Debt Issuance Costs, Gross |  |  |  | 787,000 | 555,000 |  |  |  |
Finance Lease, Liability, Total |  |  |  | 445,000 | $ 839,000 |  |  |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization |  |  |  | 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 |  |  |  | 79,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature |  |  |  | $ 23,000,000 |  |  |  |  |
Proceeds from Lines of Credit, Total |  |  | $ 30,000,000 |  |  |  |  |  |
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 |  |  |  | 2.98% | 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 |  |

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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 Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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