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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, 2022
Nov. 30, 2021
Net sales $ 19,952,766 $ 18,193,413
Gross profit 6,353,124 5,702,930
Net income 502,242 4,493,759
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,189,404 1,374,749
EXCOR and All Other Joint Venturs [Member]    
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,189,400 1,374,749
Northern Technologies International Corporation's dividends received from joint ventures 3,042,688 5,042,271
EXCOR [Member]    
Northern Technologies International Corporation’s share of equity in income from joint ventures 871,144 910,773
Northern Technologies International Corporation's dividends received from joint ventures 2,459,500 4,255,200
All Other [Member]    
Northern Technologies International Corporation’s share of equity in income from joint ventures 318,260 463,976
Northern Technologies International Corporation's dividends received from joint ventures 583,188 787,071
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Net sales 24,730,289 27,022,995
Gross profit 9,693,568 11,032,959
Net income 2,646,908 2,777,605
EXCOR [Member]    
Net sales 10,145,921 11,300,228
Gross profit 4,720,042 5,468,986
Net income 1,742,287 1,821,547
Joint Ventures in France [Member]    
Net sales   15,722,767
Gross profit   5,563,973
Net income   $ 956,058
All Other [Member]    
Net sales 14,584,368  
Gross profit 4,973,526  
Net income $ 904,621