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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
--- | ---
Nov. 30, 2020 | Nov. 30, 2019
Net sales | $ 12,779,112 | $ 14,631,400
Gross profit | 4,465,791 | 4,826,316
Net income | 1,262,399 | 1,212,550
Northern Technologies International Corporation’s share of equity in income from joint ventures | 1,825,712 | 1,293,990
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Net sales | 26,777,343 | 25,460,294
Gross profit | 12,441,761 | 11,357,134
Net income | 3,651,424 | 2,587,980
Northern Technologies International Corporation’s share of equity in income from joint ventures | 1,825,712 | 1,293,990
Northern Technologies International Corporation's dividends received from joint ventures | 1,125,361 | 205,432
EXCOR [Member] |  |
Net sales | 9,551,483 | 9,368,239
Gross profit | 5,699,007 | 5,325,488
Net income | 2,021,074 | 1,642,327
Northern Technologies International Corporation’s share of equity in income from joint ventures | 1,010,537 | 821,163
Northern Technologies International Corporation's dividends received from joint ventures | 0 | 0
All Other [Member] |  |
Net sales | 17,225,860 | 16,092,055
Gross profit | 6,742,754 | 6,031,646
Net income | 1,630,350 | 945,653
Northern Technologies International Corporation’s share of equity in income from joint ventures | 815,175 | 472,827
Northern Technologies International Corporation's dividends received from joint ventures | $ 1,125,361 | $ 205,432

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