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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
NET SALES:        
Net sales, excluding joint ventures $ 4,485,203 $ 4,125,618 $ 9,255,590 $ 8,403,261
Net sales, to joint ventures 761,147 848,710 1,282,507 1,403,181
Total net sales 5,246,350 4,974,328 10,538,097 9,806,442
Cost of goods sold 3,633,913 3,480,082 7,324,885 6,689,558
Gross profit 1,612,437 1,494,246 3,213,212 3,116,884
JOINT VENTURE OPERATIONS:        
Equity in income of joint ventures 1,138,438 1,224,675 2,292,734 2,582,355
Fees for services provided to joint ventures 1,770,881 1,298,126 3,617,158 2,743,378
Total joint venture operations 2,909,319 2,522,801 5,909,892 5,325,733
OPERATING EXPENSES:        
Selling expenses 1,174,065 1,014,082 2,345,160 2,122,568
General and administrative expenses 1,143,987 1,100,812 2,392,683 2,370,825
Expenses incurred in support of joint ventures 321,456 235,557 691,143 435,821
Research and development expenses 912,393 974,777 1,850,599 1,789,082
Total operating expenses 3,551,901 3,325,228 7,279,585 6,718,296
OPERATING INCOME 969,855 691,819 1,843,519 1,724,321
INTEREST INCOME 22,288 12,631 47,634 20,691
INTEREST EXPENSE (6,988) (7,284) (13,462) (13,250)
OTHER INCOME   6,825   13,650
INCOME BEFORE INCOME TAX EXPENSE 985,155 703,991 1,877,691 1,745,412
INCOME TAX EXPENSE 240,000 100,000 374,000 206,000
NET INCOME 745,155 603,991 1,503,691 1,539,412
NET INCOME ATTRIBUTABLE TO NON CONTROLLING INTEREST 310,745 (2,202) 679,659 (25,538)
NET INCOME ATTRIBUTABLE TO NTIC $ 434,410 $ 606,193 $ 824,032 $ 1,564,950
NET INCOME PER COMMON SHARE:        
Basic (in Dollars per share) $ 0.10 $ 0.14 $ 0.19 $ 0.36
Diluted (in Dollars per share) $ 0.10 $ 0.14 $ 0.18 $ 0.35
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:        
Basic (in Shares) 4,418,821 4,398,356 4,409,954 4,366,932
Diluted (in Shares) 4,485,076 4,466,435 4,460,197 4,440,001