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Note F - Debt Facilities (Details) (USD $) | 3 Months Ended |  | 0 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Sep. 20, 2012 Credit Facilities, Amendment No. 1 [Member] Revolving Credit Facility [Member] | Feb. 04, 2013 Credit Facilities, Amendment No. 2 [Member] Revolving Credit Facility [Member] Minimum [Member] | Feb. 04, 2013 Credit Facilities, Amendment No. 2 [Member] Revolving Credit Facility [Member] Maximum [Member] | Jun. 24, 2013 Credit Facilities, Amendment No. 3 [Member] Revolving Credit Facility [Member] | Feb. 13, 2014 Credit Facilities, Amendment No. 4 [Member] Revolving Credit Facility [Member] | Jul. 31, 2014 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] | Jul. 31, 2014 Revolving Credit Facility [Member] | Apr. 30, 2014 Revolving Credit Facility [Member] | Mar. 09, 2012 Revolving Credit Facility [Member]
Note F - Debt Facilities (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  |  |  |  | 2.41% | 2.40% |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 145,000,000 |  |  |  |  |  | $ 145,000,000 |  | $ 125,000,000
Contract Term of Contracts Included by Credit Facilities Amendment |  |  |  | 36 months | 42 months |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  | Jun. 24, 2016 |  |  | Jun. 24, 2016 |  |
Line of Credit Facility, Additional Borrowing Capacity |  |  |  |  |  | 55,000,000 |  |  |  |  |
Decrease in Pricing Tiers, Percent |  |  |  |  |  | 0.25% |  |  |  |  |
Maximum Allowable Capital Expenditures By Credit Facilities Amendment |  |  |  |  |  |  | 10,000,000 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 2.25% |  |  |
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases | 40,000,000 |  |  |  |  |  |  |  | 40,000,000 |  |
Line of Credit Facility, Distribution Limitations, Percentage of Sum of Borrowing Bases | 25.00% |  |  |  |  |  |  |  | 25.00% |  |
Line of Credit Facility, Distribution Limitations, Percentage of Consolidated Net income | 75.00% |  |  |  |  |  |  |  | 75.00% |  |
Line of Credit Facility, Distribution Limitations, Minimum Percentage of Aggregate Funds Available | 12.50% |  |  |  |  |  |  |  | 12.50% |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  | 48,000,000 |  |
Amortization of Financing Costs and Discounts | $ 46,000 | $ 73,000 |  |  |  |  |  |  |  |  |

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- Definition Represents the contract term of contracts included by Credit Facilities Amendment. + References No definition available. + Details
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- Definition Represents the additional borrowing capacity of a line of credit facility. + References No definition available. + Details
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- Definition Represents decrease in pricing tiers percentage. + References No definition available. + Details
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- Definition Represents the distribution limitations, maximum aggregate amount of stock repurchases. + References No definition available. + Details
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- Definition Represents the distribution limitations, minimum percentage of aggregate funds available. + References No definition available. + Details
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- Definition Represents the distribution limitations, percentage of consolidated net income. + References No definition available. + Details
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- Definition Represents the distribution limitations, percentage of sum of borrowing bases. + References No definition available. + Details
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- Definition Represents the amount of capital expenditures allowable under Credit Facilities in the aggregate during any fiscal year. + References No definition available. + Details
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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 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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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 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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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. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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