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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
NET SALES:    
Net sales, excluding joint ventures $ 13,610,865 $ 11,035,407
Net sales, to joint ventures 483,187 507,631
Total net sales 14,094,052 11,543,038
Cost of goods sold 9,461,137 7,888,470
Gross profit 4,632,915 3,654,568
JOINT VENTURE OPERATIONS:    
Equity in income from joint ventures 2,004,162 1,741,328
Fees for services provided to joint ventures 1,428,435 1,507,142
Total joint venture operations 3,432,597 3,248,470
OPERATING EXPENSES:    
Selling expenses 2,811,094 2,599,949
General and administrative expenses 2,495,797 2,219,745
Research and development expenses 872,157 798,731
Total operating expenses 6,179,048 5,618,425
OPERATING INCOME 1,886,464 1,284,613
INTEREST INCOME 12,787 24,056
INTEREST EXPENSE (2,357) (5,089)
INCOME BEFORE INCOME TAX EXPENSE 1,896,894 1,303,580
INCOME TAX EXPENSE 255,703 104,991
NET INCOME 1,641,191 1,198,589
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 144,132 114,963
NET INCOME ATTRIBUTABLE TO NTIC $ 1,497,059 $ 1,083,626
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ 0.33 $ 0.24
Diluted (in dollars per share) $ 0.32 $ 0.24
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in shares) 4,542,175 4,537,368
Diluted (in shares) 4,739,288 4,608,788
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.12 $ 0.10