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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
 12 Months Ended 15 Months Ended
Aug. 31, 2015
Nov. 30, 2016
Current assets $ 48,922,924 $ 49,972,755
Total assets 52,407,026 53,440,384
Current liabilities 12,433,700 13,028,054
Noncurrent liabilities 100,783 106,084
Joint ventures’ equity 39,872,543 40,306,246
Northern Technologies International Corporation’s share of joint ventures’ equity 19,854,064 20,052,432
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 17,779,912 17,978,218
Northern Technologies International Corporation's dividends received from joint ventures 5,503,314
EXCOR [Member]    
Current assets 22,928,810 23,405,119
Total assets 24,733,340 25,180,484
Current liabilities 3,485,213 3,220,529
Noncurrent liabilities
Joint ventures’ equity 21,248,109 21,959,955
Northern Technologies International Corporation’s share of joint ventures’ equity 10,624,056 10,979,979
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 10,593,151 10,949,074
Northern Technologies International Corporation's dividends received from joint ventures 4,364,700
Joint Venture in India [Member]    
Current assets 4,027,016 4,278,839
Total assets 4,352,573 4,615,462
Current liabilities 1,097,231 1,242,944
Noncurrent liabilities 6,382 5,619
Joint ventures’ equity 3,248,960 3,366,900
Northern Technologies International Corporation’s share of joint ventures’ equity 1,624,480 1,683,450
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 759,658 818,628
Northern Technologies International Corporation's dividends received from joint ventures 326,023
Joint Venture in Finland [Member]    
Current assets 1,928,861 2,038,343
Total assets 2,211,392 2,302,907
Current liabilities 546,506 583,354
Noncurrent liabilities
Joint ventures’ equity 1,664,886 1,719,553
Northern Technologies International Corporation’s share of joint ventures’ equity 832,442 859,775
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 812,442 839,775
Northern Technologies International Corporation's dividends received from joint ventures 206,516
All Other [Member]    
Current assets 20,038,237 20,250,454
Total assets 21,109,721 21,341,531
Current liabilities 7,304,730 7,981,227
Noncurrent liabilities 94,401 100,465
Joint ventures’ equity 13,710,588 13,259,838
Northern Technologies International Corporation’s share of joint ventures’ equity 6,773,086 6,529,228
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 5,614,661 5,370,741
Northern Technologies International Corporation's dividends received from joint ventures $ 606,075