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Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 17, 2013 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) [Line Items] |  |  |  |
Long-term Debt, Fair Value |  | $ 841,000,000 | $ 721,000,000 |
Number Of Notes |  | 2 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 100,000,000 |
Line of Credit Facility, Decrease, Forgiveness | 25,000,000 |  |  |
Interest Income (Expense), Net |  | 214,000 | 211,000 | 208,000
Interest Costs Capitalized |  | 1,177,000 | 894,000 | 674,000
Note1 And Note 2 [Member] |  |  |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) [Line Items] |  |  |  |
Debt Instrument Carrying Amount Of Each Note |  | 50,000,000 |  |
Note 1 [Member] |  |  |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) [Line Items] |  |  |  |
Interest Over Index |  | 0.75% |  |
Note 2 [Member] |  |  |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) [Line Items] |  |  |  |
Interest Over Index |  | 1.00% |  |
Note 3 [Member] |  |  |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) [Line Items] |  |  |  |
Line of Credit Facility, Amount Outstanding |  | $ 0 | $ 59,100,000 |

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- Definition Interest Over Index + References No definition available. + Details
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- Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 10 -Article 9 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 decrease in line of credit facility from forgiveness by the holder of the line of credit. + References No definition available. + 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 The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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