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Note F - Debt Facilities (Details Textual) - USD ($)				6 Months Ended
	Sep. 30, 2019	Mar. 29, 2018	Dec. 15, 2015	Oct. 31, 2019	Oct. 31, 2018	Sep. 29, 2019	Apr. 30, 2019
Amortization of Debt Issuance Costs and Discounts, Total				$ 115,000	$ 138,000
Debt Related Commitment Fees and Debt Issuance Costs				435,000	$ 5,000
Debt Issuance Costs, Gross				875,000			$ 555,000
Long-term Debt, Total				137,000			194,000
Capital Lease Obligations, Total				646,000			839,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation				258,000			$ 177,000
Assets Held under Capital Leases [Member]
Property, Plant and Equipment, Useful Life		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%
Revolving Credit Facility [Member]
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature				63,000,000
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases				$ 50,000,000
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases				20.00%
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income				75.00%
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available				12.50%
Revolving Credit Facility [Member] | Minimum [Member]
Debt Agreement, Accounts Receivable Advances, Term Range One	1 year 60 days
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				4.14%			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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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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, 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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