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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Aug. 31, 2018
Current assets	$ 58,993,098		$ 58,086,747
Total assets	63,792,622		62,803,261
Current liabilities	16,579,222		15,991,886
Noncurrent liabilities	409,444		403,653
Joint ventures’ equity	46,789,400		46,407,722
Northern Technologies International Corporation’s share of joint ventures’ equity	23,111,834		22,950,995
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	21,082,622		20,921,783
Northern Technologies International Corporation's dividends received from joint ventures	1,486,705	$ 63,937
EXCOR [Member]
Current assets	28,075,384		27,354,788
Total assets	30,821,905		30,033,750
Current liabilities	4,629,942		4,535,954
Noncurrent liabilities
Joint ventures’ equity	26,191,964		25,497,796
Northern Technologies International Corporation’s share of joint ventures’ equity	13,095,984		12,748,899
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	13,065,079		12,717,994
Northern Technologies International Corporation's dividends received from joint ventures	843,750
All Other [Member]
Current assets	30,917,714		30,731,959
Total assets	32,970,717		32,769,511
Current liabilities	11,949,280		11,455,932
Noncurrent liabilities	409,444		403,653
Joint ventures’ equity	20,597,436		20,909,926
Northern Technologies International Corporation’s share of joint ventures’ equity	10,015,850		10,195,263
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	8,017,543		$ 8,203,789
Northern Technologies International Corporation's dividends received from joint ventures	$ 642,955	$ 63,937

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