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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
NET SALES:        
Net sales, excluding joint ventures $ 4,125,618 $ 4,093,107 $ 8,403,261 $ 7,539,410
Net sales, to joint ventures 848,710 685,011 1,403,181 1,337,149
Total net sales 4,974,328 4,778,118 9,806,442 8,876,559
Cost of goods sold 3,480,082 3,006,232 6,689,558 5,696,937
Gross profit 1,494,246 1,771,886 3,116,884 3,179,622
JOINT VENTURE OPERATIONS:        
Equity in income of joint ventures 1,224,675 1,129,659 2,582,355 2,824,790
Fees for services provided to joint ventures 1,298,126 1,402,149 2,743,378 2,853,929
Total joint venture operations 2,522,801 2,531,808 5,325,733 5,678,719
OPERATING EXPENSES:        
Selling expenses 1,014,082 921,554 2,122,568 1,920,607
General and administrative expenses 1,100,812 1,069,636 2,370,825 2,173,803
Expenses incurred in support of joint ventures 235,557 249,275 435,821 477,996
Research and development expenses 974,777 907,170 1,789,082 2,100,626
Total operating expenses 3,325,228 3,147,635 6,718,296 6,673,032
OPERATING INCOME 691,819 1,156,059 1,724,321 2,185,309
INTEREST INCOME 12,631 676 20,691 4,609
INTEREST EXPENSE (7,284) (22,241) (13,250) (45,475)
OTHER INCOME 6,825 6,725 13,650 13,650
INCOME BEFORE INCOME TAX EXPENSE 703,991 1,141,219 1,745,412 2,158,093
INCOME TAX EXPENSE 100,000 140,000 206,000 262,000
NET INCOME 603,991 1,001,219 1,539,412 1,896,093
NET INCOME ATTRIBUTABLE TO NON CONTROLLING INTEREST (2,202) 52,180 (25,538) 47,273
NET INCOME ATTRIBUTABLE TO NTIC $ 606,193 $ 949,039 $ 1,564,950 $ 1,848,820
NET INCOME PER COMMON SHARE:        
Basic (in Dollars per share) $ 0.14 $ 0.22 $ 0.36 $ 0.43
Diluted (in Dollars per share) $ 0.14 $ 0.22 $ 0.35 $ 0.42
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:        
Basic (in Shares) 4,398,356 4,340,934 4,366,932 4,281,399
Diluted (in Shares) 4,466,435 4,419,921 4,440,001 4,351,177