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Note 6 - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015
EXCOR [Member] |  |
Net sales | $ 35,138,214 | $ 36,872,664
Gross profit | 18,635,421 | 19,993,763
Net income | 7,049,462 | 8,201,659
Northern Technologies International Corporation’s share of equity in income from joint ventures | 3,534,113 | 4,091,608
All Other [Member] |  |
Net sales | 55,508,619 | 62,153,587
Gross profit | 21,805,305 | 28,403,555
Net income | 2,485,309 | 3,647,448
Northern Technologies International Corporation’s share of equity in income from joint ventures | 1,209,718 | 1,844,957
Net sales | 90,646,833 | 99,026,251
Gross profit | 40,440,726 | 48,397,318
Net income | 9,534,771 | 11,849,107
Northern Technologies International Corporation’s share of equity in income from joint ventures | $ 4,743,831 | $ 5,936,565

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