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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Net sales $ 79,902,952 $ 74,158,890
Gross profit 27,803,831 23,068,592
Net income 2,912,276 6,324,700
Northern Technologies International Corporation’s share of equity in income of joint ventures 6,452,719 4,725,918
EXCOR and All Other Joint Venturs [Member]    
Net income 8,934,198 9,302,237
Northern Technologies International Corporation’s share of equity in income of joint ventures 6,452,719 4,725,918
Northern Technologies International Corporation’s dividends received from joint ventures 5,639,198 5,723,176
EXCOR [Member]    
Net income 5,730,311 6,487,855
Northern Technologies International Corporation’s share of equity in income of joint ventures 2,852,229 3,236,989
Northern Technologies International Corporation’s dividends received from joint ventures 2,459,500 4,255,200
All Other [Member]    
Net income 3,203,887 2,814,382
Northern Technologies International Corporation’s share of equity in income of joint ventures 3,600,490 1,488,929
Northern Technologies International Corporation’s dividends received from joint ventures 3,179,698 1,467,976
EXCOR and All Other Joint Venturs [Member]    
Net sales 100,682,316 104,077,748
Gross profit 40,096,561 41,030,647
EXCOR [Member]    
Net sales 39,642,380 42,853,162
Gross profit 19,016,389 20,312,400
All Other [Member]    
Net sales 61,039,936 61,224,586
Gross profit $ 21,080,172 $ 20,718,247