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Note 2 - 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 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Note 2 - 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 $ 5,877,033 $ 7,804,904 $ 16,415,130 $ 17,611,346
Cost of goods sold 4,054,364 4,143,514 11,379,249 10,833,072
Gross profit 1,822,669 3,661,390 4,935,881 6,778,274
Joint venture operations 3,358,282 2,557,309 9,268,174 7,883,042
Operating expenses 3,687,180 3,780,363 10,966,765 10,498,659
Operating income 1,493,771 2,438,336 3,337,290 4,162,657
Income before income tax expense 1,445,769 2,454,623 3,323,460 4,200,035
Income tax expense 158,000 814,000 532,000 1,020,000
Net income 1,287,769 1,640,623 2,791,460 3,180,035
Net income attributable to non-controlling interest 360,657 186,586 1,040,316 161,048
Net income attributable to NTIC 927,112 1,454,037 1,751,144 3,018,987
Net income per common diluted share (in Dollars per share) $ 0.21 $ 0.33 $ 0.39 $ 0.68
As Reported [Member]
        
Note 2 - 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   7,804,904   17,611,346
Cost of goods sold   4,143,514   10,833,072
Gross profit   3,661,390   6,778,274
Joint venture operations   2,557,309   7,883,042
Operating expenses   3,780,363   10,498,659
Operating income   2,438,336   4,162,657
Income before income tax expense   2,454,623   4,200,035
Income tax expense   814,000   1,020,000
Net income   1,640,623   3,180,035
Net income attributable to non-controlling interest   186,586   161,048
Net income attributable to NTIC   1,454,037   3,018,987
Net income per common diluted share (in Dollars per share)   $ 0.33   $ 0.68
NTI ASEAN [Member]
        
Note 2 - 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   870,663   2,569,943
Operating expenses   110,637   133,772
Operating income   760,026   2,436,171
Income before income tax expense   760,026   2,436,171
Income tax expense   99,208   284,019
Net income   660,818   2,152,152
Net income attributable to non-controlling interest   (264,327)   (860,861)
Net income attributable to NTIC   396,491   1,291,291
Net income per common diluted share (in Dollars per share)   $ 0.09   $ 0.29
Eliminated in Consolidation [Member]
        
Note 2 - 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   (384,115)   (1,076,230)
Operating income   (384,115)   (1,076,230)
Income before income tax expense   (384,115)   (1,076,230)
Net income   (384,115)   (1,076,230)
Net income attributable to NTIC   (384,115)   (1,076,230)
Net income per common diluted share (in Dollars per share)   $ (0.09)   $ (0.24)
Pro Forma [Member]
        
Note 2 - 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   7,804,904   17,611,346
Cost of goods sold   4,143,514   10,833,072
Gross profit   3,661,390   6,778,274
Joint venture operations   3,043,857   9,376,755
Operating expenses   3,891,000   10,632,431
Operating income   2,814,247   5,522,598
Income before income tax expense   2,830,534   5,559,976
Income tax expense   913,208   1,304,019
Net income   1,917,326   4,255,957
Net income attributable to non-controlling interest   (77,741)   (699,813)
Net income attributable to NTIC   $ 1,466,413   $ 3,234,048
Net income per common diluted share (in Dollars per share)   $ 0.33   $ 0.73