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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 | 9 Months Ended
--- | --- | ---
May 31, 2022 | May 31, 2021 | May 31, 2022 | May 31, 2021
Net sales |  | $ 18,964,921 | $ 15,418,524 | $ 53,906,973 | $ 40,980,518
Gross profit |  | 6,242,088 | 5,265,942 | 16,929,353 | 13,982,936
Net income |  | 1,000,167 | 2,053,916 | 5,676,773 | 4,628,890
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | 1,364,597 | 2,033,536 | 3,662,178 | 5,779,260
EXCOR and All Other Joint Venturs [Member] |  |  |  |  |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | 1,364,597 | 2,033,536 | 3,662,178 | 5,779,260
Northern Technologies International Corporation’s dividends received from joint ventures |  | 252,000 | 181,952 | 5,723,176 | 3,505,455
EXCOR [Member] |  |  |  |  |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | 824,784 | 1,039,576 | 2,324,605 | 3,182,691
Northern Technologies International Corporation’s dividends received from joint ventures |  | 0 | 0 | 4,255,200 | 1,809,900
All Other [Member] |  |  |  |  |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | 539,813 |  |  |
Northern Technologies International Corporation’s dividends received from joint ventures |  | 252,000 |  |  |
Joint Ventures in France [Member] |  |  |  |  |
Northern Technologies International Corporation’s share of equity in income from joint ventures | [1] |  | 993,960 | 1,337,572 | 2,596,569
Northern Technologies International Corporation’s dividends received from joint ventures | [1] |  | 181,952 | 1,467,976 | 1,695,555
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |
Net sales |  | 26,594,077 | 31,959,539 | 78,218,839 | 87,795,284
Gross profit |  | 10,626,570 | 14,280,775 | 31,504,531 | 39,802,014
Net income |  | 2,714,979 | 4,051,518 | 7,344,175 | 11,540,949
EXCOR [Member] |  |  |  |  |
Net sales |  | 10,397,916 | 12,103,263 | 31,010,578 | 32,196,843
Gross profit |  | 4,990,697 | 6,863,786 | 15,118,133 | 18,661,980
Net income |  | 1,654,389 | 2,068,326 | 4,646,123 | 6,351,721
All Other [Member] |  |  |  |  |
Net sales |  | 16,196,160 |  |  |
Gross profit |  | 5,635,873 |  |  |
Net income |  | $ 1,060,590 |  |  |
Joint Ventures in France [Member] |  |  |  |  |
Net sales | [1] |  | 19,856,276 | 47,208,261 | 55,598,441
Gross profit | [1] |  | 7,416,989 | 16,386,398 | 21,140,034
Net income | [1] |  | $ 1,983,192 | $ 2,698,052 | $ 5,189,228
[1] | Includes Zerust India since Zerust India was not a consolidated subsidiary of the Company as of August 31, 2021 or May 31, 2021. See Note 3 entitled “Business Combination.”

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