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Note 7 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 3 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Net sales $ 21,338,393 $ 20,181,675
Gross profit 8,162,953 7,334,274
Net income 561,091 895,521
NTIC’s share of equity in income from joint ventures 1,129,593 1,102,241
EXCOR and All Other Joint Venturs [Member]    
Net income 2,259,187 2,204,482
NTIC’s share of equity in income from joint ventures 1,129,593 1,102,241
NTIC’s dividends received from joint ventures 0 371,104
EXCOR [Member]    
Net income 1,247,500 1,026,907
NTIC’s share of equity in income from joint ventures 623,750 513,453
NTIC’s dividends received from joint ventures 0 0
All Other [Member]    
Net income 1,011,687 1,177,575
NTIC’s share of equity in income from joint ventures 505,843 588,788
NTIC’s dividends received from joint ventures 0 371,104
EXCOR and All Other Joint Venturs [Member]    
Net sales 23,837,010 23,560,661
Gross profit 10,315,283 10,103,800
EXCOR [Member]    
Net sales 8,738,814 8,420,960
Gross profit 4,757,686 4,375,075
All Other [Member]    
Net sales 15,098,196 15,139,701
Gross profit $ 5,557,597 $ 5,728,725