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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 6 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Net sales $ 19,072,066 $ 20,842,538 $ 40,410,459 $ 41,024,213
Gross profit 6,795,584 8,339,164 14,958,537 15,673,438
Net income 434,319 1,701,169 995,410 2,596,690
NTIC’s share of equity in income from joint ventures 620,730 1,177,990 1,750,323 2,280,231
EXCOR and All Other Joint Venturs [Member]        
Net income 1,219,970 2,353,152 3,479,157 4,557,634
NTIC’s share of equity in income from joint ventures 620,730 1,177,990 1,750,323 2,280,231
NTIC’s dividends received from joint ventures 680,737 2,020,147 680,737 2,391,251
EXCOR [Member]        
Net income 520,787 1,378,844 1,768,287 2,405,751
NTIC’s share of equity in income from joint ventures 268,251 690,882 892,001 1,204,335
NTIC’s dividends received from joint ventures 0 1,624,950 0 1,624,950
All Other [Member]        
Net income 699,183 974,308 1,710,870 2,151,883
NTIC’s share of equity in income from joint ventures 352,479 487,109 858,322 1,075,896
NTIC’s dividends received from joint ventures 680,737 395,197 680,737 766,301
EXCOR and All Other Joint Venturs [Member]        
Net sales 19,799,875 23,479,980 43,636,885 47,040,641
Gross profit 8,241,116 10,139,080 18,556,399 20,242,880
EXCOR [Member]        
Net sales 6,904,045 9,163,636 15,642,859 17,584,596
Gross profit 3,598,163 4,829,931 8,355,849 9,205,006
All Other [Member]        
Net sales 12,895,830 14,316,344 27,994,026 29,456,045
Gross profit $ 4,642,953 $ 5,309,149 $ 10,200,550 $ 11,037,874