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Note 2 - NTI ASEAN (Detail) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: (USD $)
 3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Net sales $ 5,246,350 $ 4,974,328 $ 10,538,097 $ 9,806,442
Cost of goods sold 3,633,913 3,480,082 7,324,885 6,689,558
Gross profit 1,612,437 1,494,246 3,213,212 3,116,884
Joint venture operations 2,909,319 2,522,801 5,909,892 5,325,733
Operating expenses 3,551,901 3,325,228 7,279,585 6,718,296
Operating income 969,855 691,819 1,843,519 1,724,321
Income before income tax expense 985,155 703,991 1,877,691 1,745,412
Income tax expense 240,000 100,000 374,000 206,000
Net income 745,155 603,991 1,503,691 1,539,412
Net income attributable to non-controlling interest 310,745 (2,202) 679,659 (25,538)
Net income attributable to NTIC 434,410 606,193 824,032 1,564,950
Net income per common diluted share (in Dollars per share) $ 0.10 $ 0.14 $ 0.18 $ 0.35
As Reported [Member]
        
Net sales   4,974,328   9,806,442
Cost of goods sold   3,480,082   6,689,558
Gross profit   1,494,246   3,116,884
Joint venture operations   2,522,801   5,325,733
Operating expenses   3,325,228   6,718,296
Operating income   691,819   1,724,321
Income before income tax expense   703,991   1,745,412
Income tax expense   100,000   206,000
Net income   603,991   1,539,412
Net income attributable to non-controlling interest   (2,202)   (25,538)
Net income attributable to NTIC   606,193   1,564,950
Net income per common diluted share (in Dollars per share)   $ 0.13   $ 0.35
NTI ASEAN [Member]
        
Joint venture operations   868,382   1,699,280
Operating expenses   20,470   23,135
Operating income   847,912   1,676,145
Income before income tax expense   847,912   1,676,145
Income tax expense   95,500   184,811
Net income   752,412   1,491,334
Net income attributable to non-controlling interest   (300,965)   (596,534)
Net income attributable to NTIC   451,447   894,800
Net income per common diluted share (in Dollars per share)   $ 0.10   $ 0.20
Eliminated in Consolidation [Member]
        
Joint venture operations   (322,654)   (692,115)
Operating income   (322,654)   (692,115)
Income before income tax expense   (322,654)   (692,115)
Net income   (322,654)   (692,115)
Net income attributable to NTIC   (322,654)   (692,115)
Net income per common diluted share (in Dollars per share)   $ (0.08)   $ (0.16)
Pro Forma [Member]
        
Net sales   4,974,328   9,806,442
Cost of goods sold   3,480,082   6,689,558
Gross profit   1,494,246   3,116,884
Joint venture operations   3,068,529   6,332,898
Operating expenses   3,345,698   6,741,431
Operating income   1,217,077   2,708,351
Income before income tax expense   1,229,249   2,729,442
Income tax expense   195,500   390,811
Net income   1,033,749   2,338,631
Net income attributable to non-controlling interest   (303,167)   (622,072)
Net income attributable to NTIC   $ 734,804   $ 1,767,635
Net income per common diluted share (in Dollars per share)   $ 0.16   $ 0.40