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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