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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
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