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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Nov. 30, 2024
Nov. 30, 2023
NET SALES:    
Net sales $ 21,338,393 $ 20,181,675
Cost of goods sold 13,175,440 12,847,401
Gross profit 8,162,953 7,334,274
JOINT VENTURE OPERATIONS:    
Equity in income from joint ventures 1,129,593 1,102,241
Fees for services provided to joint ventures 1,284,119 1,248,958
Total joint venture operations 2,413,712 2,351,199
OPERATING EXPENSES:    
Selling expenses 4,267,654 3,686,058
General and administrative expenses 3,858,943 3,517,061
Research and development expenses 1,343,397 1,105,921
Total operating expenses 9,469,994 8,309,040
OPERATING INCOME 1,106,671 1,376,433
INTEREST INCOME 25,567 46,442
INTEREST EXPENSE (120,220) (111,138)
INCOME BEFORE INCOME TAX EXPENSE 1,012,018 1,311,737
INCOME TAX EXPENSE 217,871 226,796
NET INCOME 794,147 1,084,941
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 233,056 189,420
NET INCOME ATTRIBUTABLE TO NTIC $ 561,091 $ 895,521
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ 0.06 $ 0.09
Diluted (in dollars per share) $ 0.06 $ 0.09
Weighted Average Number of Shares Outstanding, Diluted [Abstract]    
Basic (in shares) 9,470,507 9,427,588
Diluted (in shares) 9,754,209 9,706,581
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.07 $ 0.07