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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
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Aug. 31, 2016 | Aug. 31, 2015
EXCOR [Member] |  |
Current assets | $ 22,928,810 | $ 22,620,323
Total assets | 24,733,340 | 24,606,880
Current liabilities | 3,485,231 | 3,360,142
Noncurrent liabilities |  |
Joint ventures’ equity | 21,248,109 | 21,246,738
Northern Technologies International Corporation’s share of joint ventures’ equity | 10,624,056 | 11,571,361
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 10,593,151 | 11,540,456
Northern Technologies International Corporation's dividends received from joint ventures | 4,364,700 | 2,440,200
All Other [Member] |  |
Current assets | 25,994,114 | 26,674,793
Total assets | 27,673,686 | 28,247,058
Current liabilities | 8,948,469 | 8,928,241
Noncurrent liabilities | 100,783 | 1,215,139
Joint ventures’ equity | 18,624,434 | 18,103,679
Northern Technologies International Corporation’s share of joint ventures’ equity | 9,216,728 | 8,972,877
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 7,186,761 | 6,942,921
Northern Technologies International Corporation's dividends received from joint ventures | 1,165,614 | 543,138
Current assets | 48,922,924 | 49,295,116
Total assets | 52,407,026 | 52,853,938
Current liabilities | 12,433,700 | 12,288,383
Noncurrent liabilities | 100,783 | 1,215,139
Joint ventures’ equity | 39,872,543 | 39,350,417
Northern Technologies International Corporation’s share of joint ventures’ equity | 19,840,774 | 20,544,238
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 17,779,912 | 18,483,377
Northern Technologies International Corporation's dividends received from joint ventures | $ 5,503,314 | $ 2,983,338

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- Definition Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.g) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 + Details
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- Definition The amount of noncurrent liabilities reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6462270&loc=d3e57205-112772 + Details
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