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Note 7 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($) | 2 Months Ended | 3 Months Ended
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2021 | Nov. 30, 2020
Revenues, Total |  |  | $ 18,193,413 | $ 12,779,112
Gross profit |  |  | 5,702,930 | 4,465,791
Net income |  |  | 4,493,759 | 1,262,399
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ 1,374,749 | 1,374,749 | 1,825,712
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |
Revenues, Total |  |  | 27,022,995 | 26,777,343
Gross profit |  |  | 11,032,959 | 12,441,761
Net income |  |  | 2,777,605 | 3,651,424
Northern Technologies International Corporation’s share of equity in income from joint ventures |  |  | 1,374,749 | 1,825,712
Northern Technologies International Corporation's dividends received from joint ventures |  |  | 5,042,271 | 1,125,361
EXCOR [Member] |  |  |  |
Revenues, Total |  |  | 11,300,228 | 9,551,483
Gross profit |  |  | 5,468,986 | 5,699,007
Net income |  |  | 1,821,547 | 2,021,074
Northern Technologies International Corporation’s share of equity in income from joint ventures |  |  | 910,773 | 1,010,537
Northern Technologies International Corporation's dividends received from joint ventures |  |  | 4,255,200 | 0
All Other [Member] |  |  |  |
Revenues, Total |  |  | 15,722,767 |
Gross profit |  |  | 5,563,973 |
Net income |  |  | 956,058 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  |  | 463,976 |
Northern Technologies International Corporation's dividends received from joint ventures |  |  | $ 787,071 |
Joint Ventures in France [Member] |  |  |  |
Revenues, Total | [1] |  |  | 17,225,860
Gross profit | [1] |  |  | 6,742,754
Net income | [1] |  |  | 1,630,350
Northern Technologies International Corporation’s share of equity in income from joint ventures | [1] |  |  | 815,175
Northern Technologies International Corporation's dividends received from joint ventures | [1] |  |  | $ 1,125,361
[1] | Includes Harita-NTI since Harita-NTI was not a consolidated subsidiary of the Company as of Augut 31, 2021 or November 30, 2020. See Note 3.

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