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Note 3 - NTI ASEAN (Details) - 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 | 12 Months Ended
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Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2013 | Aug. 31, 2012
Note 3 - NTI ASEAN (Details) - 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: [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 6,086,734 | $ 5,877,033 | $ 5,246,350 | $ 5,291,747 |  |  |  |  | $ 22,501,864 | $ 22,781,653
Cost of goods sold |  |  |  |  |  |  |  |  | 15,473,212 | 14,528,785
Gross profit | 1,992,771 | 1,822,669 | 1,612,437 | 1,600,775 | 1,474,594 | 3,661,390 | 1,494,246 | 1,622,638 | 7,028,652 | 8,252,868
Joint venture operations |  |  |  |  |  |  |  |  | 12,590,691 | 10,142,707
Operating expenses |  |  |  |  |  |  |  |  | 14,654,367 | 13,825,806
Operating income |  |  |  |  |  |  |  |  | 4,964,976 | 4,569,769
Income before income tax expense | 2,294,041 | 1,445,769 | 985,155 | 892,536 | 416,611 | 2,454,623 | 703,991 | 1,041,421 | 5,617,501 | 4,616,646
Income tax expense | 332,000 | 158,000 | 240,000 | 134,000 | (32,000) | 814,000 | 100,000 | 106,000 | 864,000 | 1,041,000
Net income | 1,962,041 | 1,287,769 | 745,155 | 758,536 | 448,611 | 1,640,623 | 603,991 | 935,421 | 4,753,501 | 3,575,646
Net income attributable to non-controlling interest | 346,291 | 360,657 | 310,745 | 368,914 |  |  |  |  | 1,386,607 | 127,450
Net income attributable to NTIC | 1,615,750 | 927,112 | 434,410 | 389,622 |  |  |  |  | 3,366,894 | 3,448,196
Net income per common diluted share (in Dollars per share) | $ 0.36 | $ 0.21 | $ 0.10 | $ 0.09 | $ 0.10 | $ 0.33 | $ 0.14 | $ 0.22 | $ 0.75 | $ 0.78
As Reported [Member] |  |  |  |  |  |  |  |  |  |
Note 3 - NTI ASEAN (Details) - 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: [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 22,781,653
Cost of goods sold |  |  |  |  |  |  |  |  |  | 14,528,785
Gross profit |  |  |  |  |  |  |  |  |  | 8,252,868
Joint venture operations |  |  |  |  |  |  |  |  |  | 10,142,707
Operating expenses |  |  |  |  |  |  |  |  |  | 13,825,806
Operating income |  |  |  |  |  |  |  |  |  | 4,569,769
Income before income tax expense |  |  |  |  |  |  |  |  |  | 4,616,646
Income tax expense |  |  |  |  |  |  |  |  |  | 1,041,000
Net income |  |  |  |  |  |  |  |  |  | 3,575,646
Net income attributable to non-controlling interest |  |  |  |  |  |  |  |  |  | 127,450
Net income attributable to NTIC |  |  |  |  |  |  |  |  |  | 3,448,196
Net income per common diluted share (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.78
NTI ASEAN [Member] |  |  |  |  |  |  |  |  |  |
Note 3 - NTI ASEAN (Details) - 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: [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture operations |  |  |  |  |  |  |  |  |  | 3,395,354
Operating expenses |  |  |  |  |  |  |  |  |  | 185,700
Operating income |  |  |  |  |  |  |  |  |  | 3,209,654
Income before income tax expense |  |  |  |  |  |  |  |  |  | 3,209,654
Income tax expense |  |  |  |  |  |  |  |  |  | 381,466
Net income |  |  |  |  |  |  |  |  |  | 2,828,188
Net income attributable to non-controlling interest |  |  |  |  |  |  |  |  |  | (1,131,275)
Net income attributable to NTIC |  |  |  |  |  |  |  |  |  | 1,696,913
Net income per common diluted share (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.38
Eliminated in Consolidation [Member] |  |  |  |  |  |  |  |  |  |
Note 3 - NTI ASEAN (Details) - 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: [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture operations |  |  |  |  |  |  |  |  |  | (1,414,248)
Operating income |  |  |  |  |  |  |  |  |  | (1,414,248)
Income before income tax expense |  |  |  |  |  |  |  |  |  | (1,414,248)
Net income |  |  |  |  |  |  |  |  |  | (1,414,248)
Net income attributable to NTIC |  |  |  |  |  |  |  |  |  | (1,414,248)
Net income per common diluted share (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.32)
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |
Note 3 - NTI ASEAN (Details) - 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: [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 22,781,653
Cost of goods sold |  |  |  |  |  |  |  |  |  | 14,528,785
Gross profit |  |  |  |  |  |  |  |  |  | 8,252,868
Joint venture operations |  |  |  |  |  |  |  |  |  | 12,123,813
Operating expenses |  |  |  |  |  |  |  |  |  | 14,011,506
Operating income |  |  |  |  |  |  |  |  |  | 6,365,175
Income before income tax expense |  |  |  |  |  |  |  |  |  | 6,412,052
Income tax expense |  |  |  |  |  |  |  |  |  | 1,422,466
Net income |  |  |  |  |  |  |  |  |  | 4,989,586
Net income attributable to non-controlling interest |  |  |  |  |  |  |  |  |  | (1,003,825)
Net income attributable to NTIC |  |  |  |  |  |  |  |  |  | $ 3,730,861
Net income per common diluted share (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.84

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