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Note 6 - Investments in Joint Ventures (Details) - Condensed Income Statement of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $) | 3 Months Ended
--- | ---
Nov. 30, 2013 | Nov. 30, 2012
Condensed Income Statements, Captions [Line Items] |  |
Net sales | $ 29,661,218 | $ 27,524,934
Gross profit | 14,166,070 | 13,127,067
Net income | 2,837,565 | 2,440,560
Northern Technologies International Corporation’s share of equity in income of joint ventures | 1,427,748 | 1,154,296
EXCOR [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 9,476,403 | 8,609,463
Gross profit | 5,063,662 | 4,434,290
Net income | 1,853,307 | 1,570,374
Northern Technologies International Corporation’s share of equity in income of joint ventures | 926,654 | 785,187
China [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 4,294,138 | 3,568,798
Gross profit | 2,016,809 | 1,730,402
Net income | 298,708 | 294,003
Northern Technologies International Corporation’s share of equity in income of joint ventures | 149,354 | 147,001
All Other [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 15,890,677 | 15,346,673
Gross profit | 7,085,599 | 6,962,375
Net income | 685,550 | 576,183
Northern Technologies International Corporation’s share of equity in income of joint ventures | $ 351,740 | $ 222,108

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- Definition The amount of gross profit (loss) 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 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 2: 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=6382943&loc=d3e33918-111571 Reference 3: 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=6382943&loc=d3e33912-111571 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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