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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.