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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, 2021
Aug. 31, 2020
Net sales by segment $ 56,493,819 $ 47,638,691
Gross profit 19,573,005 16,029,417
Net income (loss) attributable to NTIC 6,281,238 (1,337,709)
Northern Technologies International Corporation’s share of equity in income of joint ventures 7,465,214 4,270,327
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Net sales by segment 120,954,550 87,030,062
Gross profit 53,371,610 39,532,750
Net income (loss) attributable to NTIC 14,921,531 8,545,473
Northern Technologies International Corporation’s share of equity in income of joint ventures 7,465,214 4,270,327
Northern Technologies International Corporation’s dividends received from joint ventures 3,665,365 5,672,099
EXCOR [Member]    
Net sales by segment 46,522,688 32,546,402
Gross profit 25,389,981 18,739,471
Net income (loss) attributable to NTIC 8,798,995 5,266,541
Northern Technologies International Corporation’s share of equity in income of joint ventures 4,400,403 2,622,423
Northern Technologies International Corporation’s dividends received from joint ventures 1,809,900 4,675,850
All Other [Member]    
Net sales by segment 74,431,862 31,308,367
Gross profit 27,981,629 11,271,171
Net income (loss) attributable to NTIC 6,122,536 1,184,834
Northern Technologies International Corporation’s share of equity in income of joint ventures 3,064,811 598,032
Northern Technologies International Corporation’s dividends received from joint ventures $ 1,855,465 249,320
Joint Ventures in France [Member]    
Net sales by segment   8,133,294
Gross profit   3,061,433
Net income (loss) attributable to NTIC   473,137
Northern Technologies International Corporation’s share of equity in income of joint ventures   237,490
Northern Technologies International Corporation’s dividends received from joint ventures   0
Joint Ventures in Finland [Member]    
Net sales by segment   3,088,865
Gross profit   1,916,001
Net income (loss) attributable to NTIC   419,728
Northern Technologies International Corporation’s share of equity in income of joint ventures   209,972
Northern Technologies International Corporation’s dividends received from joint ventures   325,635
Joint Ventures in India [Member]    
Net sales by segment   5,481,303
Gross profit   2,498,196
Net income (loss) attributable to NTIC   697,349
Northern Technologies International Corporation’s share of equity in income of joint ventures   349,218
Northern Technologies International Corporation’s dividends received from joint ventures   261,220
Joint Ventures in Thailand [Member]    
Net sales by segment   6,471,831
Gross profit   2,046,478
Net income (loss) attributable to NTIC   503,884
Northern Technologies International Corporation’s share of equity in income of joint ventures   253,192
Northern Technologies International Corporation’s dividends received from joint ventures   $ 160,074