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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
NET SALES:        
Net sales, excluding joint ventures $ 7,553,957 $ 6,056,078 $ 20,030,491 $ 17,188,462
Net sales, to joint ventures 723,618 864,742 2,189,888 2,260,466
Total net sales 8,277,575 6,920,820 22,220,379 19,448,928
Cost of goods sold 5,595,207 4,669,322 15,059,558 12,879,186
Gross profit 2,682,368 2,251,498 7,160,821 6,569,742
JOINT VENTURE OPERATIONS:        
Equity in income of joint ventures 1,724,915 1,593,465 4,806,247 4,416,664
Fees for services provided to joint ventures 1,303,964 2,001,775 4,432,494 6,169,094
Total joint venture operations 3,028,879 3,595,240 9,238,741 10,585,758
OPERATING EXPENSES:        
Selling expenses 1,434,627 1,315,264 4,168,955 3,925,466
General and administrative expenses 1,703,083 1,307,653 4,794,206 3,905,082
Expenses incurred in support of joint ventures 327,586 353,958 1,510,830 1,049,691
Research and development expenses 1,064,710 1,104,632 2,968,879 3,342,497
Total operating expenses 4,530,006 4,081,507 13,442,870 12,222,736
OPERATING INCOME 1,181,241 1,765,231 2,956,692 4,932,764
INTEREST INCOME 7,943 1,369 25,504 5,728
INTEREST EXPENSE (6,004) (7,063) (14,232) (32,709)
OTHER INCOME     2,145  
INCOME BEFORE INCOME TAX EXPENSE 1,183,180 1,759,537 2,970,109 4,905,783
INCOME TAX EXPENSE 114,180 361,280 495,478 819,039
NET INCOME 1,069,000 1,398,257 2,474,631 4,086,744
NET INCOME ATTRIBUTABLE TO NON- CONTROLLING INTEREST 163,565 418,040 689,575 1,222,897
NET INCOME ATTRIBUTABLE TO NTIC $ 905,435 $ 980,217 $ 1,785,056 $ 2,863,847
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:        
Basic (in Dollars per share) $ 0.20 $ 0.22 $ 0.40 $ 0.64
Diluted (in Dollars per share) $ 0.20 $ 0.21 $ 0.39 $ 0.63
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:        
Basic (in Shares) 4,525,109 4,461,880 4,519,279 4,452,798
Diluted (in Shares) 4,594,992 4,590,344 4,635,561 4,583,174