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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
 6 Months Ended 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Aug. 31, 2016
Current assets $ 51,803,644   $ 48,922,924
Total assets 55,467,386   52,407,026
Current liabilities 13,028,897   12,433,700
Noncurrent liabilities 107,511   100,783
Joint ventures’ equity 42,330,978   39,872,543
Northern Technologies International Corporation’s share of joint ventures’ equity 21,059,113   19,840,774
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 18,984,898   17,779,912
Northern Technologies International Corporation's dividends received from joint ventures 564,934 $ 4,054,605 5,503,314
EXCOR [Member]      
Current assets 25,396,338   22,928,810
Total assets 27,220,507   24,733,340
Current liabilities 3,027,106   3,485,213
Noncurrent liabilities  
Joint ventures’ equity 24,193,401   21,248,109
Northern Technologies International Corporation’s share of joint ventures’ equity 12,096,702   10,624,056
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 12,065,797   10,593,151
Northern Technologies International Corporation's dividends received from joint ventures 32,523,000 4,364,700
Joint Venture in India [Member]      
Current assets 4,342,356   4,027,016
Total assets 4,674,322   4,352,573
Current liabilities 1,485,452   1,097,231
Noncurrent liabilities 3,684   6,382
Joint ventures’ equity 3,185,186   3,248,960
Northern Technologies International Corporation’s share of joint ventures’ equity 1,592,593   1,624,480
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 727,771   759,658
Northern Technologies International Corporation's dividends received from joint ventures 206,701 326,023 326,023
Joint Venture in Finland [Member]      
Current assets 1,625,779   1,928,861
Total assets 1,905,434   2,211,392
Current liabilities 484,988   546,506
Noncurrent liabilities  
Joint ventures’ equity 1,420,446   1,664,886
Northern Technologies International Corporation’s share of joint ventures’ equity 710,221   832,442
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 690,221   812,442
Northern Technologies International Corporation's dividends received from joint ventures 200,768 206,516 206,516
All Other [Member]      
Current assets 20,439,171   20,038,237
Total assets 21,667,123   21,109,721
Current liabilities 8,031,351   7,304,730
Noncurrent liabilities 103,827   94,401
Joint ventures’ equity 13,531,945   13,710,588
Northern Technologies International Corporation’s share of joint ventures’ equity 6,659,597   6,759,796
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 5,501,109   5,614,661
Northern Technologies International Corporation's dividends received from joint ventures $ 157,465 $ 269,766 $ 606,075