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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, 2020 | Aug. 31, 2019
Net sales by segment | $ 47,638,691 | $ 55,750,137
Gross profit | 16,029,417 | 17,779,893
Net (loss) income attributable to NTIC | (1,337,709) | 5,209,622
Northern Technologies International Corporation’s share of equity in income of joint ventures | 4,270,327 | 7,225,518
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Net sales by segment | 87,030,062 | 114,635,435
Gross profit | 39,532,750 | 51,312,013
Net (loss) income attributable to NTIC | 8,545,473 | 14,688,999
Northern Technologies International Corporation’s share of equity in income of joint ventures | 4,270,327 | 7,225,518
Northern Technologies International Corporation’s dividends received from joint ventures | 5,672,099 | 5,039,041
EXCOR [Member] |  |
Net sales by segment | 32,546,402 | 47,015,841
Gross profit | 18,739,471 | 25,622,261
Net (loss) income attributable to NTIC | 5,266,541 | 10,827,448
Northern Technologies International Corporation’s share of equity in income of joint ventures | 2,622,423 | 5,415,362
Northern Technologies International Corporation’s dividends received from joint ventures | 4,675,850 | 3,345,600
Joint Ventures in France [Member] |  |
Net sales by segment | 8,133,294 |
Gross profit | 3,061,433 |
Net (loss) income 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 |  |
Joint Ventures in Finland [Member] |  |
Net sales by segment | 3,088,865 |
Gross profit | 1,916,001 |
Net (loss) income 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 (loss) income 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 (loss) income 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 |
All Other [Member] |  |
Net sales by segment | 31,308,367 | 67,619,594
Gross profit | 11,271,171 | 25,689,752
Net (loss) income attributable to NTIC | 1,184,834 | 3,861,551
Northern Technologies International Corporation’s share of equity in income of joint ventures | 598,032 | 1,810,156
Northern Technologies International Corporation’s dividends received from joint ventures | $ 249,320 | $ 1,693,441

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