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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
NET SALES:    
Net sales, excluding joint ventures $ 53,470,623 $ 45,666,045
Net sales, to joint ventures 3,023,196 1,972,646
Total net sales 56,493,819 47,638,691
Cost of goods sold 36,920,814 31,609,274
Gross profit 19,573,005 16,029,417
JOINT VENTURE OPERATIONS:    
Equity in income from joint ventures 7,465,214 4,270,327
Fees for services provided to joint ventures 5,964,260 4,612,885
To Total joint venture operations 13,429,474 8,883,212
OPERATING EXPENSES:    
Selling expenses 12,016,974 10,656,689
General and administrative expenses 8,262,173 8,688,309
Research and development expenses 4,400,479 3,979,455
Total operating expenses 24,679,626 23,324,453
OPERATING INCOME 8,322,853 1,588,176
INTEREST INCOME 151,875 167,733
INTEREST EXPENSE (16,086) (16,034)
INCOME BEFORE INCOME TAX EXPENSE 8,458,642 1,739,875
INCOME TAX EXPENSE 1,461,905 2,674,635
NET INCOME (LOSS) 6,996,737 (934,760)
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 715,499 402,949
NET INCOME (LOSS) ATTRIBUTABLE TO NTIC $ 6,281,238 $ (1,337,709)
NET INCOME (LOSS) ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ 0.69 $ (0.15)
Diluted (in dollars per share) $ 0.64 $ (0.15)
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in shares) 9,116,472 9,096,981
Diluted (in shares) 9,874,139 9,096,981
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.20 $ 0.13