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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, 2018	Aug. 31, 2017
Net sales	$ 120,060,897	$ 101,261,132
Gross profit	53,348,459	44,861,300
Net income	15,300,276	11,839,933
Equity in income from joint ventures	7,527,383	5,898,908
Northern Technologies International Corporation’s dividends received from joint ventures	3,697,503	6,377,054
EXCOR [Member]
Net sales	47,537,949	39,849,757
Gross profit	25,584,666	21,133,632
Net income	11,095,523	8,369,728
Equity in income from joint ventures	5,549,765	4,185,988
Northern Technologies International Corporation’s dividends received from joint ventures	2,357,544	5,379,062
All Other [Member]
Net sales	72,522,948	61,411,375
Gross profit	27,763,793	23,727,668
Net income	4,204,753	3,470,205
Equity in income from joint ventures	1,977,618	1,712,920
Northern Technologies International Corporation’s dividends received from joint ventures	$ 1,339,959	$ 997,992

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