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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 9 Months Ended 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Aug. 31, 2017
Net sales $ 31,480,885 $ 25,935,169 $ 90,200,146 $ 73,098,215  
Gross profit 14,209,819 11,517,711 40,529,217 32,376,247  
Net income 4,540,968 3,379,883 11,753,467 8,562,834  
Northern Technologies International Corporation’s share of equity in income from joint ventures 2,246,066 1,686,016 5,793,391 4,343,159  
Northern Technologies International Corporation’s dividends received from joint ventures     2,941,807 5,179,786 $ 6,377,054
EXCOR [Member]          
Net sales 12,219,414 9,884,546 35,450,664 28,169,978  
Gross profit 6,823,609 5,271,028 19,315,099 15,032,724  
Net income 3,113,660 2,166,435 8,272,237 6,184,181  
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,558,243 1,083,494 4,138,814 3,089,935  
Northern Technologies International Corporation’s dividends received from joint ventures     1,780,392 4,240,400 5,379,062
All Other [Member]          
Net sales 19,261,471 16,050,623 54,749,482 44,928,237  
Gross profit 7,386,210 6,246,683 21,214,118 17,343,523  
Net income 1,427,308 1,213,448 3,481,230 2,378,653  
Northern Technologies International Corporation’s share of equity in income from joint ventures $ 687,823 $ 602,522 1,654,577 1,253,224  
Northern Technologies International Corporation’s dividends received from joint ventures     $ 1,161,415 $ 939,386 $ 997,992