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Note F- Debt Facilities (Details Textual) - USD ($)				9 Months Ended		12 Months Ended
	Oct. 08, 2014	Jun. 24, 2013	Feb. 04, 2013	Jan. 31, 2016	Jan. 31, 2015	Apr. 30, 2015	Feb. 18, 2016	Feb. 17, 2016	Feb. 13, 2014	Sep. 30, 2012	Mar. 09, 2012
Revolving Credit Facility [Member] | Credit Facilities Amendment Number 5 [Member]
Line of Credit Facility, Expiration Date	Oct. 08, 2017
Line of Credit Facility Increase in Pricing Tiers Percent	0.125%
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases	$ 40,000,000
Dividend Restrictions Percentage of Sum of Borrowing Bases	30.00%
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] | Minimum [Member]
Contract Term of Contracts Included by Credit Facilities Amendment			3 years
Revolving Credit Facility [Member] | Maximum [Member]
Contract Term of Contracts Included by Credit Facilities Amendment			3 years 180 days
Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 172,500,000	$ 145,000,000
Line of Credit Facility, Total Increase in Borrowing Capacity							27,500,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature							55,000,000
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature							$ 200,000,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate				2.375%
Revolving Credit Facility [Member]
Line of Credit Facility, Expiration Date		Jun. 24, 2016		Oct. 08, 2017
Line of Credit Facility, Maximum Borrowing Capacity				$ 145,000,000						$ 145,000,000	$ 125,000,000
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases				$ 40,000,000
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases				30.00%
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, Remaining Borrowing Capacity				$ 22
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases				30.00%
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 Financing Costs and Discounts				$ 144,000	$ 165,000
Debt Issuance Cost				$ 319,000		$ 464,000

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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

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+ 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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- Definition

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

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- Definition

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- Definition

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- Definition

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

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- Definition

Represents increase in pricing tiers percentage.

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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.

+ References

No definition available.

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- Definition

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

+ 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

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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