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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
Nov. 30, 2012
Nov. 30, 2011
Net sales $ 5,291,747 $ 4,832,114
Cost of goods sold 3,690,972 3,209,476
Gross profit 1,600,775 1,622,638
Joint venture operations 3,000,573 2,802,932
Operating expenses 3,727,684 3,393,068
Operating income 873,664 1,032,502
Income before income tax expense 892,536 1,041,421
Income tax expense 134,000 106,000
Net income 758,536 935,421
Net income attributable to non-controlling interest 368,914 (23,336)
Net income attributable to NTIC 389,622 958,757
Net income per common diluted share (in Dollars per share) $ 0.09 $ 0.22
As Reported [Member]
    
Net sales   4,832,114
Cost of goods sold   3,209,476
Gross profit   1,622,638
Joint venture operations   2,802,932
Operating expenses   3,393,068
Operating income   1,032,502
Income before income tax expense   1,041,421
Income tax expense   106,000
Net income   935,421
Net income attributable to non-controlling interest   (23,336)
Net income attributable to NTIC   958,757
Net income per common diluted share (in Dollars per share)   $ 0.22
NTI ASEAN [Member]
    
Joint venture operations   830,898
Operating expenses   2,665
Operating income   828,233
Income before income tax expense   828,233
Income tax expense   89,311
Net income   738,922
Net income attributable to non-controlling interest   (295,569)
Net income attributable to NTIC   443,535
Net income per common diluted share (in Dollars per share)   $ 0.10
Eliminated in Consolidation [Member]
    
Joint venture operations   (369,461)
Operating income   (369,461)
Income before income tax expense   (369,461)
Net income   (369,461)
Net income attributable to NTIC   (369,461)
Net income per common diluted share (in Dollars per share)   $ (0.08)
Pro Forma [Member]
    
Net sales   4,832,114
Cost of goods sold   3,209,476
Gross profit   1,622,638
Joint venture operations   3,264,369
Operating expenses   3,395,733
Operating income   1,491,274
Income before income tax expense   1,500,193
Income tax expense   195,311
Net income   1,304,882
Net income attributable to non-controlling interest   (318,905)
Net income attributable to NTIC   $ 1,032,831
Net income per common diluted share (in Dollars per share)   $ 0.24