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Note F - Debt Facilities (Details Textual) - USD ($)				3 Months Ended
	Dec. 12, 2016	Oct. 31, 2016	Dec. 15, 2015	Jul. 31, 2017	Jul. 31, 2016	Apr. 30, 2017	Feb. 18, 2016
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases				25.00%
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%
Amortization of Debt Issuance Costs and Discounts				$ 59,000	$ 70,000
Debt Issuance Costs, Line of Credit Arrangements, Net				28,000		$ 449,000
Debt Issuance Costs, Gross				561,000		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				386,000		$ 413,000
Revolving Credit Facility [Member]
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases	$ 40,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 200,000,000			$ 200,000,000			$ 172,500,000
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				25.00%
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%
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature	$ 50,000,000			$ 79,000,000
Debt Agreement, Accounts Receivable Advances, Term Range One, Rate	55.00%	50.00%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate				2.375%
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

X

- Definition

Represents information about accounts receivable advances term range one included by credit facilities amendment.

+ References

No definition available.

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- Definition

Represents the advance rate on accounts receivable advances term range one included by credit facilities amendment.

+ References

No definition available.

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X

- Definition

Represents information about accounts receivable advances term range two included by credit facilities amendment.

+ References

No definition available.

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- Definition

Represents the advance rate on accounts receivable advances term range two included by credit facilities amendment.

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No definition available.

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X

- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Represents the distribution limitations, minimum percentage of aggregate funds available.

+ References

No definition available.

+ Details

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X

- Definition

Represents the distribution limitations, percentage of consolidated net income.

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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X

- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Section 50
-Paragraph 3
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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 30
-Section S45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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X

- Details

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- Details

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