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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
NET SALES:        
Net sales, excluding joint ventures $ 5,041,096 $ 7,175,825 $ 14,296,686 $ 15,579,086
Net sales, to joint ventures 835,937 629,079 2,118,444 2,032,260
Total 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:        
Equity in income of joint ventures 1,440,335 1,822,972 3,733,069 4,405,327
Fees for services provided to joint ventures 1,917,947 734,337 5,535,105 3,477,715
Total joint venture operations 3,358,282 2,557,309 9,268,174 7,883,042
OPERATING EXPENSES:        
Selling expenses 1,243,687 1,270,996 3,588,847 3,393,564
General and administrative expenses 1,105,710 1,147,744 3,498,393 3,518,569
Expenses incurred in support of joint ventures 335,132 294,169 1,026,275 729,990
Research and development expenses 1,002,651 1,067,454 2,853,250 2,856,536
Total 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
INTEREST INCOME 2,984 15,726 50,618 36,417
INTEREST EXPENSE (50,986) (6,264) (64,448) (19,514)
OTHER INCOME   6,825   20,475
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 SHARE:        
Basic (in Dollars per share) $ 0.21 $ 0.33 $ 0.40 $ 0.69
Diluted (in Dollars per share) $ 0.21 $ 0.33 $ 0.39 $ 0.68
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:        
Basic (in Shares) 4,421,379 4,399,290 4,415,452 4,379,175
Diluted (in Shares) 4,468,861 4,461,044 4,464,774 4,448,472