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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016	Aug. 31, 2016
Net sales			$ 47,163,046	$ 42,000,424
Gross profit			20,858,536	18,523,102
Net income			5,182,951	3,872,728
Northern Technologies International Corporation’s share of equity in income of joint ventures	$ 1,383,139	$ 952,667	2,657,143	1,936,420
Northern Technologies International Corporation’s dividends received from joint ventures			564,934	4,054,605	$ 5,503,314
EXCOR [Member]
Net sales			18,285,432	15,618,735
Gross profit			9,761,696	8,059,186
Net income			4,017,746	2,960,951
Northern Technologies International Corporation’s share of equity in income of joint ventures			2,006,441	1,480,975
Northern Technologies International Corporation’s dividends received from joint ventures				32,523,000	4,364,700
Joint Venture in India [Member]
Net sales			3,263,830	3,036,404
Gross profit			1,518,122	1,450,777
Net income			192,164	316,292
Northern Technologies International Corporation’s share of equity in income of joint ventures			170,549	157,474
Northern Technologies International Corporation’s dividends received from joint ventures			206,701	326,023	326,023
Joint Venture in Finland [Member]
Net sales			1,726,555	1,581,287
Gross profit			1,032,318	943,141
Net income			252,140	207,973
Northern Technologies International Corporation’s share of equity in income of joint ventures			126,361	104,070
Northern Technologies International Corporation’s dividends received from joint ventures			200,768	206,516	206,516
All Other [Member]
Net sales			23,887,229	21,763,999
Gross profit			8,546,400	8,069,998
Net income			720,901	387,512
Northern Technologies International Corporation’s share of equity in income of joint ventures			353,792	193,900
Northern Technologies International Corporation’s dividends received from joint ventures			$ 157,465	$ 269,766	$ 606,075

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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The amount of gross profit (loss) reported by an equity method investment of the entity.

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