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Note F - Debt Facilities (Details Textual)						6 Months Ended			12 Months Ended
	Mar. 29, 2018 USD ($)	Oct. 25, 2017 USD ($)	Dec. 12, 2016 USD ($)	Oct. 31, 2016	Dec. 15, 2015 USD ($)	Apr. 30, 2018 USD ($)	Oct. 25, 2017 USD ($)	Oct. 24, 2017 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)	Feb. 18, 2016 USD ($)
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases									20.00%
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases						$ 50,000,000		$ 40
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%
Amortization of Debt Issuance Costs and Discounts, Total									$ 260,000	$ 252,000	$ 214,000
Debt Issuance Costs, Gross						435,000			435,000	$ 593,000
Debt Issuance Costs, Line of Credit Arrangements, Net, Total						103,000			103,000
Capital Lease Obligations, Total	$ 1,100,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation						14,000			14,000
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%
Long-term Debt, Total						305,000			305,000
Revolving Credit Facility [Member]
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases		$ 50,000,000	$ 40,000,000
Line of Credit Facility, Maximum Borrowing Capacity			200,000,000									$ 172,500,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature			$ 50,000,000			46,000,000			$ 46,000,000
Debt Agreement, Accounts Receivable Advances, Term Range One, Rate			55.00%	50.00%
Debt Agreement, Accounts Receivable Advances, Term Range Two, Rate			50.00%	45.00%
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases		20.00%						25.00%	20.00%
Leverage Ratio, Maximum Threshold		1.75					1.75
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases						$ 50	$ 40,000,000
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] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate										3.37%
Revolving Credit Facility [Member] | Second Pricing Tier [Member]
Debt Instrument, Interest Rate, Increase (Decrease)		(0.025%)
Revolving Credit Facility [Member] | Third Pricing Tier [Member]
Debt Instrument, Interest Rate, Increase (Decrease)		(0.125%)
Revolving Credit Facility [Member] | Fourth Pricing Tier [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		2.875%
Revolving Credit Facility [Member] | Minimum [Member]
Debt Agreement, Accounts Receivable Advances, Term Range One			3 years 30 days
Debt Agreement, Accounts Receivable Advances, Term Range Two			3 years 210 days
Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate									2.35%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Agreement, Accounts Receivable Advances, Term Range One			3 years 180 days
Debt Agreement, Accounts Receivable Advances, Term Range Two			5 years
Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate									4.25%

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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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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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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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