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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 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Net sales $ 15,418,524 $ 9,744,823 $ 40,980,518 $ 37,610,006
Gross profit 5,265,942 3,245,721 13,982,936 12,618,519
Net income 2,053,916 (965,221) 4,628,890 427,163
Northern Technologies International Corporation’s share of equity in income from joint ventures 2,033,536 811,787 5,779,260 3,466,581
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]        
Net sales 31,959,539 18,782,233 87,795,284 68,531,897
Gross profit 14,280,775 8,647,784 39,802,014 31,107,491
Net income 4,051,518 1,610,524 11,540,949 6,920,047
Northern Technologies International Corporation’s share of equity in income from joint ventures 2,033,536 811,787 5,779,260 3,466,581
Northern Technologies International Corporation’s dividends received from joint ventures 181,952 89,227 3,505,455 5,648,153
EXCOR [Member]        
Net sales 12,103,263 7,753,631 32,196,843 26,102,046
Gross profit 6,863,786 4,478,739 18,661,980 15,066,309
Net income 2,068,326 1,071,899 6,351,721 4,492,254
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,039,576 536,540 3,182,691 2,246,930
Northern Technologies International Corporation’s dividends received from joint ventures 0 0 1,809,900 4,675,850
All Other [Member]        
Net sales 19,856,276 11,028,602 55,598,441 42,429,851
Gross profit 7,416,989 4,169,045 21,140,034 16,041,182
Net income 1,983,192 538,625 5,189,228 2,427,793
Northern Technologies International Corporation’s share of equity in income from joint ventures 993,960 275,247 2,596,569 1,219,651
Northern Technologies International Corporation’s dividends received from joint ventures $ 181,952 $ 89,227 $ 1,695,555 $ 972,303