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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

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