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Note F - Debt Facilities (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 29, 2020 | Mar. 29, 2018 | Dec. 15, 2015 | Mar. 31, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Feb. 10, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2019 | Sep. 29, 2019
Proceeds from Lines of Credit, Total |  |  |  |  | $ 73,337,000 | $ 442,490,000 | $ 450,554,000 |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |  |  |  | 2,893,000 | 59,560,000 |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts, Total |  |  |  |  | 391,000 | 273,000 | 251,000 |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  | 282,000 | 505,000 | $ 371,000 |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  | 678,000 | 787,000 |  |  |  |  |  |
Finance Lease, Liability, Total |  |  |  |  | $ 0 | $ 445,000 |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Payment Period (Month) |  |  |  |  | 18 months |  |  |  |  |  |  |
Minimum [Member] | Medium-term Vehicle Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Payment Period (Month) | 36 months |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Long-term Vehicle Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Payment Period (Month) | 42 months |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Payment Period (Month) |  |  |  |  | 54 years |  |  |  |  |  |  |
Maximum [Member] | Medium-term Vehicle Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Payment Period (Month) | 42 months |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Long-term Vehicle Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Payment Period (Month) | 60 months |  |  |  |  |  |  |  |  |  |  |
BMO Harris Bank [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 326,000,000 |  |
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables | 15.00% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Aggregate Consideration for Businesses Acquired in One Year | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Disposal of Real Estate | 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Disposal Other Properties | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Total Increase in Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 85,000,000 |  |
Maximum Allowable Capital Expenditures By Credit Facilities Amendment |  |  |  |  |  |  |  | $ 25,000,000 | $ 10,000,000 |  |  |
BMO Harris Bank [Member] | Medium-term Vehicle Contracts [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables | 15.00% |  |  |  |  |  |  |  |  |  |  |
BMO Harris Bank [Member] | Long-term Vehicle Contracts [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables | 5.00% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature |  |  |  |  | $ 99,100,000 |  |  |  |  |  |  |
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 |  |  |  |  | 2.85% | 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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