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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