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Note F - Debt Facilities (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Apr. 30, 2011 | Nov. 30, 2010 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Sep. 20, 2012 | Mar. 09, 2012 | Mar. 31, 2012 Amendment to Credit Facilities (Member) | Nov. 30, 2010 Refinancing Revolving Credit Facilities (Member)
Note F - Debt Facilities (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.70% | 2.74% |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 145,000,000 |  |  | $ 145,000,000 | $ 125,000,000 |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.50% |  |  |  |  |  |
Line of Credit Facility, Maximum Stock Repurchase Amount |  |  |  | 40,000,000 |  |  |  |  |  |
Percent of Borrowing Base |  |  |  | 25.00% |  |  |  |  |  |
Line of Credit Facility, Percent of Consolidated Net Income |  |  |  | 75.00% |  |  |  |  |  |
Line of Credit Facility, Percent of Aggregate Funds |  |  |  | 12.50% |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 40,000,000 |  |  |  |  |  |
Debt Issuance Cost | 42,000 |  |  |  |  |  |  |  | 306,000 | 530,000
Amortization of Financing Costs and Discounts |  |  |  | 209,000 | 182,000 | 88,000 |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  | (507,000) |  |  | (507,000) |  |  |  |
Derivative Asset, Notional Amount |  | 20,000,000 |  |  |  | 20,000,000 |  |  |  |
Derivative, Fixed Interest Rate |  | 6.68% |  |  |  | 6.68% |  |  |  |
Derivative, Variable Interest Rate |  | 5.00% |  |  |  | 5.00% |  |  |  |
Derivative, Gain on Derivative |  | 1,300,000 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  |  |  |  |  | $ 72,000 |  |  |  |

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- Definition Line of Credit Facility, Maximum Stock Repurchase Amount + References No definition available. + Details
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- Definition Line of Credit Facility, Percent of Aggregate Funds + References No definition available. + Details
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- Definition Line of Credit Facility, Percent of Consolidated Net Income + References No definition available. + Details
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- Details
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- Definition Percent of Borrowing Base + 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + 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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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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