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

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

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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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 of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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