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Note F - Debt Facilities (Details Textual)						6 Months Ended
	Oct. 31, 2017 USD ($)	Oct. 25, 2017 USD ($)	Dec. 12, 2016 USD ($)	Oct. 31, 2016	Dec. 15, 2015 USD ($)	Oct. 31, 2017 USD ($)	Oct. 24, 2017 USD ($)	Oct. 31, 2016 USD ($)	Apr. 30, 2017 USD ($)	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						$ 40,000,000
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%
Amortization of Debt Issuance Costs and Discounts						$ 125,000		$ 140,000
Debt Issuance Costs, Line of Credit Arrangements, Net	153,000					153,000			$ 449,000
Debt Issuance Costs, Gross	621,000					621,000			593,000
Note Payable Related to the Property Purchase Agreement [Member]
Debt Instrument, Face Amount					$ 550,000
Debt Instrument, Periodic Payment					$ 10,005
Debt Instrument, Interest Rate, Stated Percentage					3.50%
Long-term Debt	359,000					359,000			$ 413,000
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		200,000,000			200,000				$ 172,500,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature	$ 60,000,000		$ 50,000,000			$ 60,000,000
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%
Leverage Ratio, Maximum Threshold		1.75
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						2.35%
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] | Maximum [Member]
Debt Agreement, Accounts Receivable Advances, Term Range One			3 years 180 days
Debt Agreement, Accounts Receivable Advances, Term Range Two			5 years

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- Definition

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- Definition

Maximum amount of stock repurchases in connection with the distribution limitations in fifth amendment related to repurchases of the Company’s stock.

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The maximum leverage ratio of the company before certain debt contingencies arise.

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- Definition

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

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- Definition

Represents the distribution limitations, percentage of consolidated net income.

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- Definition

Represents the distribution limitations, percentage of sum of borrowing bases.

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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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

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

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- Definition

Face (par) amount of debt instrument at time of issuance.

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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- Definition

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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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