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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 | 9 Months Ended
--- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  |  | $ 82,788,711 | $ 83,746,872
Gross profit |  |  | 39,447,084 | 40,201,265
Net income |  |  | 7,626,711 | 8,165,791
Northern Technologies International Corporation’s share of equity in income of joint ventures | 1,440,335 | 1,822,972 | 3,733,069 | 4,405,327
EXCOR [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  |  | 26,043,775 | 25,785,840
Gross profit |  |  | 13,624,792 | 13,423,067
Net income |  |  | 4,954,595 | 4,830,477
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 2,478,109 | 2,396,596
China [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  |  | 10,802,206 |
Gross profit |  |  | 5,134,820 |
Net income |  |  | 815,664 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 407,809 |
All Other [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  |  | 45,942,730 | 41,594,775
Gross profit |  |  | 20,687,472 | 19,594,413
Net income |  |  | 1,856,452 | 1,393,897
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 847,151 | 932,501
NTI ASEAN [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  |  |  | 16,366,258
Gross profit |  |  |  | 7,183,786
Net income |  |  |  | 1,941,417
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  |  | $ 1,076,230

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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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