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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
NET SALES:    
Net sales, excluding joint ventures $ 4,770,387 $ 4,277,643
Net sales, to joint ventures 521,360 554,471
Total 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:    
Equity in income of joint ventures 1,154,296 1,357,680
Fees for services provided to joint ventures 1,846,277 1,445,252
Total joint venture operations 3,000,573 2,802,932
OPERATING EXPENSES:    
Selling expenses 1,171,095 1,108,486
General and administrative expenses 1,248,696 1,270,013
Expenses incurred in support of joint ventures 369,687 200,264
Research and development expenses 938,206 814,305
Total operating expenses 3,727,684 3,393,068
OPERATING INCOME 873,664 1,032,502
INTEREST INCOME 25,346 8,060
INTEREST EXPENSE (6,474) (5,966)
OTHER INCOME   6,825
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 (LOSS) ATTRIBUTABLE TO NON CONTROLLING INTEREST 368,914 (23,336)
NET INCOME ATTRIBUTABLE TO NTIC $ 389,622 $ 958,757
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in Dollars per share) $ 0.09 $ 0.22
Diluted (in Dollars per share) $ 0.09 $ 0.22
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in Shares) 4,406,205 4,355,666
Diluted (in Shares) 4,440,436 4,433,724