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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
NET SALES:    
Net sales, excluding joint ventures $ 11,035,407 $ 9,000,224
Net sales, to joint ventures 507,631 701,799
Total net sales 11,543,038 9,702,023
Cost of goods sold 7,888,470 6,612,766 [1]
Gross profit 3,654,568 3,089,257
JOINT VENTURE OPERATIONS:    
Equity in income from joint ventures 1,741,328 1,274,004
Fees for services provided to joint ventures 1,507,142 1,315,591
Total joint venture operations 3,248,470 2,589,595
OPERATING EXPENSES:    
Selling expenses 2,599,949 2,039,084
General and administrative expenses 2,219,745 2,471,780
Research and development expenses 798,731 642,522
Total operating expenses 5,618,425 5,153,386
OPERATING INCOME 1,284,613 525,466
INTEREST INCOME 24,056 3,563
INTEREST EXPENSE (5,089) (4,623)
INCOME BEFORE INCOME TAX EXPENSE 1,303,580 524,406
INCOME TAX EXPENSE 104,991 117,713
NET INCOME 1,198,589 406,693
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 114,963 109,054
NET INCOME ATTRIBUTABLE TO NTIC $ 1,083,626 $ 297,639
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ 0.24 $ 0.07
Diluted (in dollars per share) $ 0.24 $ 0.07
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in shares) 4,537,368 4,531,950
Diluted (in shares) 4,608,788 4,558,878
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.10 $ 0
[1] The percent of segment sales is calculated by dividing the direct cost of goods sold for each individual segment category by the net sales for each segment category.