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Note N - Quarterly Results of Operations (unaudited) (Details) - Quarterly Results of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Quarterly Results of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 125,535 | $ 118,922 | $ 110,219 | $ 110,000 | $ 113,481 | $ 105,365 | $ 110,807 | $ 100,524 | $ 464,676 | $ 430,177 | $ 379,251
Gross profit | 47,269 | 45,274 | 41,990 | 42,112 | 42,723 | 39,659 | 42,321 | 38,762 | 176,645 | 163,465 |
Net income | 8,789 | 7,980 | 7,278 | 8,118 | 9,641 | 7,304 | 7,760 | 8,282 | 32,165 | 32,987 | 28,215
Net income attributable to common stockholders | $ 8,779 | $ 7,970 | $ 7,268 | $ 8,108 | $ 9,631 | $ 7,294 | $ 7,750 | $ 8,272 | $ 32,125 | $ 32,947 | $ 28,175
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.97 | $ 0.88 | $ 0.80 | $ 0.87 | $ 1.01 | $ 0.76 | $ 0.79 | $ 0.81 | $ 3.53 | $ 3.36 | $ 2.59
Diluted (in Dollars per share) | $ 0.92 | $ 0.84 | $ 0.76 | $ 0.83 | $ 0.97 | $ 0.73 | $ 0.77 | $ 0.78 | $ 3.36 | $ 3.24 | $ 2.54

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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