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Note 2 - Correction of Immaterial Errors (Details) - Financial Revisions - Quarterly Statement of Cash Flow Data (unaudited) (Incomplete) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Oct. 31, 2013 | Jan. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Net income | $ 20,932 | $ 12,653 | $ 39,430 | $ 53,795 | $ 21,604 | $ 13,757 | $ 31,146 | $ 37,307 | $ 21,509 | $ 16,162 | $ 37,632 | $ 39,391 | $ 93,225 | $ 105,878 | $ 126,820 | $ 103,814 | $ 114,694
Deferred income taxes |  |  |  | 1,828 |  |  |  |  |  |  |  |  | 8,633 | 10,118 | (17,089) | (31,828) | (53,141)
Accrued expenses |  |  |  | 23,214 |  |  |  |  |  |  |  |  | 19,277 | 28,665 | 33,818 | 15,783 | 10,944
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 14,669 | 41,319 | 55,710 |  |  |  |  |  |  |  |  | 97,029 | 111,698 | 134,514 | 110,625 | 116,791
Deferred income taxes |  |  |  | 3,122 |  |  |  |  |  |  |  |  | 11,202 | 14,030 | (22,283) | (36,530) | (54,589)
Accrued expenses |  |  |  | $ 20,005 |  |  |  |  |  |  |  |  | $ 12,904 | $ 18,933 | $ 20,930 | $ 4,270 | $ 7,399

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