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Note F - Debt Facilities (Details Textual) - USD ($)							12 Months Ended
	Dec. 12, 2016	Oct. 31, 2016	Dec. 15, 2015	Oct. 08, 2014	Jun. 24, 2013	Feb. 04, 2013	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015	Feb. 18, 2016	Feb. 17, 2016	Feb. 13, 2014	Sep. 30, 2012	Mar. 09, 2012
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							$ 252,000	$ 214,000	$ 188,000
Debt Issuance Costs, Line of Credit Arrangements, Net							449,000
Debt Issuance Costs, Gross							593,000	$ 396,000
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							413,000
Revolving Credit Facility [Member]
Line of Credit Facility, Total Increase in Borrowing Capacity										$ 27,500,000
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature										200,000,000
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	$ 145,000,000		$ 145,000,000	$ 125,000,000
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			$ 55,000,000
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%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate							2.375%
Revolving Credit Facility [Member] | Credit Facilities, Amendment Number 3 [Member]
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature					$ 55,000,000
Line of Credit Facility, Decrease in Pricing Tiers, Percent					0.25%
Revolving Credit Facility [Member] | Credit Facilities, Amendment Number 4 [Member]
Maximum Allowable Capital Expenditures By Credit Facilities Amendment												$ 10,000,000
Revolving Credit Facility [Member] | Credit Facilities Amendment Number 5 [Member]
Line of Credit Facility Increase in Pricing Tiers Percent				0.125%
Revolving Credit Facility [Member] | Minimum [Member]
Contract Term of Contracts Included by Credit Facilities Amendment						3 years
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]
Contract Term of Contracts Included by Credit Facilities Amendment						3 years 180 days
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

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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- Definition

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

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

Line of credit facility, percentage of decrease in pricing piers.

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No definition available.

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- Definition

Represents increase in pricing tiers percentage.

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No definition available.

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- 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 with an accordion feature.

+ References

No definition available.

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- Definition

Amount of increase under the credit facility.

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- Definition

Amount of capital expenditures allowable under Credit Facilities in the aggregate during any fiscal year.

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No definition available.

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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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No definition available.

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- Definition

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

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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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