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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Net sales | $ 114,635,435 | $ 120,060,897
Gross profit | 51,312,013 | 53,348,459
Net income | 14,688,999 | 15,300,276
Northern Technologies International Corporation’s share of equity in income of joint ventures | 7,225,518 | 7,527,383
Northern Technologies International Corporation’s dividends received from joint ventures | 5,039,041 | 3,697,503
EXCOR [Member] |  |
Net sales | 47,015,841 | 47,537,949
Gross profit | 25,622,261 | 25,584,666
Net income | 10,827,448 | 11,095,523
Northern Technologies International Corporation’s share of equity in income of joint ventures | 5,415,362 | 5,549,765
Northern Technologies International Corporation’s dividends received from joint ventures | 3,345,600 | 2,357,544
All Other [Member] |  |
Net sales | 67,619,594 | 72,522,948
Gross profit | 25,689,752 | 27,763,793
Net income | 3,861,551 | 4,204,753
Northern Technologies International Corporation’s share of equity in income of joint ventures | 1,810,156 | 1,977,618
Northern Technologies International Corporation’s dividends received from joint ventures | $ 1,693,441 | $ 1,339,959

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