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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
NET SALES:    
Net sales, excluding joint ventures $ 4,277,643 $ 3,446,303
Net sales, to joint ventures 554,471 652,138
NET SALES 4,832,114 4,098,441
Cost of goods sold 3,209,476 2,690,705
Gross profit 1,622,638 1,407,736
JOINT VENTURE OPERATIONS:    
Equity in income of joint ventures 1,357,680 1,695,131
Fees for services provided to joint ventures 1,445,252 1,451,780
2,802,932 3,146,911
OPERATING EXPENSES:    
Selling expenses 1,108,486 999,053
General and administrative expenses 1,270,013 1,104,167
Expenses incurred in support of joint ventures 200,264 228,721
Research and development expenses 814,305 1,193,456
3,393,068 3,525,397
OPERATING INCOME 1,032,502 1,029,250
INTEREST INCOME 8,060 3,933
INTEREST EXPENSE (5,966) (23,234)
OTHER INCOME 6,825 6,925
INCOME BEFORE INCOME TAX EXPENSE 1,041,421 1,016,874
INCOME TAX EXPENSE 106,000 122,000
NET INCOME 935,421 894,874
NET LOSS ATTRIBUTABLE TO NON-CONTROLLING INTEREST (23,336) (4,907)
NET INCOME ATTRIBUTABLE TO NTIC $ 958,757 $ 899,781
NET INCOME PER COMMON SHARE:    
Basic (in Dollars per share) $ 0.22 $ 0.21
Diluted (in Dollars per share) $ 0.22 $ 0.21
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in Shares) 4,355,666 4,264,187
Diluted (in Shares) 4,433,724 4,324,757