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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 | 9 Months Ended
--- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020
Net sales | $ 15,418,524 | $ 9,744,823 | $ 40,980,518 | $ 37,610,006
Gross profit | 5,265,942 | 3,245,721 | 13,982,936 | 12,618,519
Net income | 2,053,916 | (965,221) | 4,628,890 | 427,163
Northern Technologies International Corporation’s share of equity in income from joint ventures | 2,033,536 | 811,787 | 5,779,260 | 3,466,581
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |
Net sales | 31,959,539 | 18,782,233 | 87,795,284 | 68,531,897
Gross profit | 14,280,775 | 8,647,784 | 39,802,014 | 31,107,491
Net income | 4,051,518 | 1,610,524 | 11,540,949 | 6,920,047
Northern Technologies International Corporation’s share of equity in income from joint ventures | 2,033,536 | 811,787 | 5,779,260 | 3,466,581
Northern Technologies International Corporation’s dividends received from joint ventures | 181,952 | 89,227 | 3,505,455 | 5,648,153
EXCOR [Member] |  |  |  |
Net sales | 12,103,263 | 7,753,631 | 32,196,843 | 26,102,046
Gross profit | 6,863,786 | 4,478,739 | 18,661,980 | 15,066,309
Net income | 2,068,326 | 1,071,899 | 6,351,721 | 4,492,254
Northern Technologies International Corporation’s share of equity in income from joint ventures | 1,039,576 | 536,540 | 3,182,691 | 2,246,930
Northern Technologies International Corporation’s dividends received from joint ventures | 0 | 0 | 1,809,900 | 4,675,850
All Other [Member] |  |  |  |
Net sales | 19,856,276 | 11,028,602 | 55,598,441 | 42,429,851
Gross profit | 7,416,989 | 4,169,045 | 21,140,034 | 16,041,182
Net income | 1,983,192 | 538,625 | 5,189,228 | 2,427,793
Northern Technologies International Corporation’s share of equity in income from joint ventures | 993,960 | 275,247 | 2,596,569 | 1,219,651
Northern Technologies International Corporation’s dividends received from joint ventures | $ 181,952 | $ 89,227 | $ 1,695,555 | $ 972,303

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