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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 29, 2024
Feb. 28, 2023
Feb. 29, 2024
Feb. 28, 2023
Net sales $ 20,842,538 $ 18,270,825 $ 41,024,213 $ 38,223,591
Gross profit 8,339,164 6,303,068 15,673,438 12,656,192
Net income 1,701,169 411,497 2,596,690 913,739
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,177,990 1,128,731 2,280,231 2,318,135
EXCOR and All Other Joint Venturs [Member]        
Net income 2,353,152 1,969,046 4,557,634 4,615,954
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,177,990 1,128,731 2,280,231 2,318,135
Northern Technologies International Corporation’s dividends received from joint ventures 2,020,147 422,048 2,391,251 3,464,736
EXCOR [Member]        
Net income 1,378,844 1,365,170 2,405,751 3,107,457
Northern Technologies International Corporation’s share of equity in income of joint ventures 690,882 676,800 1,204,335 1,547,944
Northern Technologies International Corporation’s dividends received from joint ventures 1,624,950 0 1,624,950 2,459,500
All Other [Member]        
Net income 974,308 603,876 2,151,883 1,508,497
Northern Technologies International Corporation’s share of equity in income of joint ventures 487,109 451,931 1,075,896 770,191
Northern Technologies International Corporation’s dividends received from joint ventures 395,197 422,048 766,301 1,005,236
EXCOR and All Other Joint Venturs [Member]        
Net sales 23,479,980 25,482,590 47,040,641 50,212,879
Gross profit 10,139,080 10,035,811 20,242,880 19,729,379
EXCOR [Member]        
Net sales 9,163,636 9,708,482 17,584,596 19,854,403
Gross profit 4,829,931 4,733,435 9,205,006 9,453,477
All Other [Member]        
Net sales 14,316,344 15,774,108 29,456,045 30,358,476
Gross profit $ 5,309,149 $ 5,302,376 $ 11,037,874 $ 10,275,902