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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
NET SALES:    
Net sales, excluding joint ventures $ 45,666,045 $ 53,142,583
Net sales, to joint ventures 1,972,646 2,607,554
Total net sales 47,638,691 55,750,137
Cost of goods sold 31,609,274 37,970,244
Gross profit 16,029,417 17,779,893
JOINT VENTURE OPERATIONS:    
Equity in income from joint ventures 4,270,327 7,225,518
Fees for services provided to joint ventures 4,612,885 5,727,579
Total joint venture operations 8,883,212 12,953,097
OPERATING EXPENSES:    
Selling expenses 10,656,689 10,968,592
General and administrative expenses 8,688,309 9,349,559
Research and development expenses 3,979,455 3,822,070
Total operating expenses 23,324,453 24,140,221
OPERATING INCOME 1,588,176 6,592,769
INTEREST INCOME 167,733 78,257
INTEREST EXPENSE (16,034) (13,567)
INCOME BEFORE INCOME TAX EXPENSE 1,739,875 6,657,459
INCOME TAX EXPENSE 2,674,635 841,837
NET (LOSS) INCOME (934,760) 5,815,622
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 402,949 606,000
NET (LOSS) INCOME ATTRIBUTABLE TO NTIC $ (1,337,709) $ 5,209,622
NET (LOSS) INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ (0.15) $ 0.57
Diluted (in dollars per share) $ (0.15) $ 0.55
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in shares) 9,096,981 9,085,584
Diluted (in shares) 9,096,981 9,415,974
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.13 $ 0.24