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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
NET SALES:    
Net sales $ 85,059,517 $ 79,902,952
Cost of goods sold 51,273,155 52,099,121
Gross profit 33,786,362 27,803,831
Joint Venture Operations [Abstract]    
Equity in income from joint ventures 4,223,296 6,452,719
Fees for services provided to joint ventures 5,251,782 5,189,185
To Total joint venture operations 9,475,078 11,641,904
Operating Expenses [Abstract]    
Selling expenses 16,413,672 15,290,897
General and administrative expenses 14,176,494 13,166,270
Research and development expenses 4,802,791 4,967,922
Total operating expenses 35,392,957 33,425,089
OPERATING INCOME 7,868,483 6,020,646
INTEREST INCOME 118,827 28,490
INTEREST EXPENSE (340,129) (461,805)
INCOME BEFORE INCOME TAX EXPENSE 7,647,181 5,587,331
INCOME TAX EXPENSE 1,325,797 1,349,600
NET INCOME 6,321,384 4,237,731
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 912,302 1,325,455
NET INCOME ATTRIBUTABLE TO NTIC $ 5,409,082 $ 2,912,276
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ 0.57 $ 0.31
Diluted (in dollars per share) $ 0.55 $ 0.3
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in shares) 9,434,020 9,359,504
Diluted (in shares) 9,833,450 9,693,482
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.28 $ 0.28