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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
NET SALES:    
Net sales, excluding joint ventures $ 5,605,018 $ 4,770,387
Net sales, to joint ventures 704,082 521,360
Total net sales 6,309,100 5,291,747
Cost of goods sold 4,158,031 3,690,972
Gross profit 2,151,069 1,600,775
JOINT VENTURE OPERATIONS:    
Equity in income of joint ventures 1,427,748 1,154,296
Fees for services provided to joint ventures 2,109,648 1,846,277
Total joint venture operations 3,537,396 3,000,573
OPERATING EXPENSES:    
Selling expenses 1,318,886 1,171,095
General and administrative expenses 1,387,496 1,248,696
Expenses incurred in support of joint ventures 329,264 369,687
Research and development expenses 1,138,520 938,206
Total operating expenses 4,174,166 3,727,684
OPERATING INCOME 1,514,299 873,664
INTEREST INCOME 1,789 25,346
INTEREST EXPENSE (13,670) (6,474)
INCOME BEFORE INCOME TAX EXPENSE 1,502,418 892,536
INCOME TAX EXPENSE 198,000 134,000
NET INCOME 1,304,418 758,536
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTEREST 445,832 368,914
NET INCOME ATTRIBUTABLE TO NTIC $ 858,586 $ 389,622
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in Dollars per share) $ 0.19 $ 0.09
Diluted (in Dollars per share) $ 0.19 $ 0.09
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in Shares) 4,434,770 4,406,205
Diluted (in Shares) 4,552,669 4,440,436