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Note 21 - Quarterly Information (Details) - USD ($)
 3 Months Ended
Aug. 31, 2015
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Net sales $ 8,102,314 $ 8,277,575 $ 6,728,709 $ 7,214,095 $ 7,377,180 $ 6,920,820 $ 6,219,008 $ 6,309,100
Gross profit 2,605,940 2,682,368 2,070,969 2,407,484 2,453,213 2,251,498 2,167,175 2,151,069
Income before income tax expense 195,925 1,183,180 139,149 1,647,780 1,757,291 1,759,537 1,643,828 1,502,418
Income tax expense 153,196 114,180 197,614 183,684 305,623 361,280 259,759 198,000
Net income 42,729 1,069,000 (58,465) 1,464,096 1,451,668 1,398,257 1,384,069 1,304,418
Net income attributable to non-controlling interests 38,214 163,565 70,179 455,831 209,143 418,040 359,025 445,832
Net income (loss) attributable to NTIC $ 4,515 $ 905,435 $ (128,644) $ 1,008,265 $ 1,242,527 $ 980,217 $ 1,025,044 $ 858,586
Basic (in dollars per share) $ 0 $ 0.20 $ (0.03) $ 0.22 $ 0.28 $ 0.22 $ 0.23 $ 0.19
Diluted (in dollars per share) $ 0 $ 0.20 $ (0.03) $ 0.22 $ 0.27 $ 0.21 $ 0.22 $ 0.19
Basic (in shares) 4,529,251 4,525,109 4,522,514 4,518,973 4,487,478 4,461,880 4,434,837 4,434,770
Diluted (in shares) 4,585,196 4,594,992 4,522,514 4,659,621 4,592,208 4,590,344 4,579,603 4,552,669