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Note 19 - Quarterly Information (Unaudited) (Details) - Quarterly Information (Unaudited) (USD $) | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Aug. 31, 2014 | May 31, 2014 | Feb. 28, 2014 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Aug. 31, 2014 | Aug. 31, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Fiscal year 2014: |  |  |  |  |  |  |  |  |  |
Net sales | $ 7,377,180 | $ 6,920,820 | $ 6,219,008 | $ 6,086,734 | $ 5,877,033 | $ 5,246,350 | $ 26,826,108 | $ 22,501,864 | $ 6,309,100 | $ 5,291,747
Gross profit | 2,453,213 | 2,251,498 | 2,167,175 | 1,992,771 | 1,822,669 | 1,612,437 | 9,022,955 | 7,028,652 | 2,151,069 | 1,600,775
Income before income tax expense | 1,757,291 | 1,759,537 | 1,643,828 | 2,294,041 | 1,445,769 | 985,155 | 6,663,074 | 5,617,501 | 1,502,418 | 892,536
Income tax expense | 305,623 | 361,280 | 259,759 | 332,000 | 158,000 | 240,000 | 1,124,662 | 864,000 | 198,000 | 134,000
Net income | 1,451,668 | 1,398,257 | 1,384,069 | 1,962,041 | 1,287,769 | 745,155 | 5,538,412 | 4,753,501 | 1,304,418 | 758,536
Net income attributable to non-controlling interests | 209,143 | 418,040 | 359,025 | 346,291 | 360,657 | 310,745 | 1,432,040 | 1,386,607 | 445,832 | 368,914
Net income attributable to NTIC | $ 1,242,527 | $ 980,217 | $ 1,025,044 | $ 1,615,750 | $ 927,112 | $ 434,410 | $ 4,106,372 | $ 3,366,894 | $ 858,586 | $ 389,622
Net income per share: |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.28 | $ 0.22 | $ 0.23 | $ 0.37 | $ 0.21 | $ 0.10 | $ 0.92 | $ 0.76 | $ 0.19 | $ 0.09
Diluted (in Dollars per share) | $ 0.27 | $ 0.21 | $ 0.22 | $ 0.36 | $ 0.21 | $ 0.10 | $ 0.90 | $ 0.75 | $ 0.19 | $ 0.09
Weighted average common shares assumed outstanding: |  |  |  |  |  |  |  |  |  |
Basic (in Shares) | 4,487,478 | 4,461,880 | 4,434,837 | 4,431,948 | 4,421,379 | 4,418,821 |  |  | 4,434,770 | 4,406,205
Diluted (in Shares) | 4,592,208 | 4,590,344 | 4,579,603 | 4,501,017 | 4,468,861 | 4,485,076 | 4,579,498 | 4,475,895 | 4,552,669 | 4,440,436

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