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Note 12 - Geographic And Segment Information (Tables) | 12 Months Ended
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Aug. 31, 2012
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Fiscal Year Ended August 31, |
|  | 2012 |  |  | 2011 |
Inside the U.S.A. to unaffiliated customers |  |  | 64.0 | % |  |  | 63.2 | %
Outside the U.S.A. to: |  |  |  |  |  |  |  |
Joint ventures in which the Company is a shareholder directly and indirectly |  |  | 12.1 | % |  |  | 16.5 | %
Unaffiliated customers |  |  | 23.9 | % |  |  | 20.3 | %
|  |  | 100.0 | % |  |  | 100.0 | %
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Fiscal 2012 |  |  | Fiscal 2011 |  |  | $ Change |  |  | % Change |
ZERUST® net sales |  | $ | 20,971,275 |  |  | $ | 18,542,523 |  |  | $ | 2,428,752 |  |  |  | 13.1 | %
Natur-Tec® net sales |  |  | 1,810,378 |  |  |  | 984,004 |  |  |  | 826,374 |  |  |  | 84.0 | %
|  | $ | 22,781,653 |  |  | $ | 19,526,527 |  |  | $ | 3,255,126 |  |  |  | 16.7 | %
Reconciliation of Cost of Good Sold from Segments to Consolidated [Table Text Block] |
|  | Fiscal 2012 |  |  | % of Product Sales* |  |  | Fiscal 2011 |  |  | % of Product Sales* |
Direct cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
ZERUST® |  | $ | 10,748,865 |  |  |  | 51.3 | % |  | $ | 10,087,637 |  |  |  | 54.4 | %
Natur-Tec® |  |  | 1,585,731 |  |  |  | 87.6 | % |  |  | 702,608 |  |  |  | 71.4 | %
Indirect cost of goods sold |  |  | 2,194,190 |  |  |  | — |  |  |  | 1,978,395 |  |  |  | — |
|  | $ | 14,528,785 |  |  |  | 63.8 | % |  | $ | 12,768,640 |  |  |  | 65.4 | %
Schedule of Condensed Balance Sheet [Table Text Block] |
|  | August 31, 2012 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Current assets |  | $ | 61,973,725 |  |  | $ | 24,357,139 |  |  | $ | 15,358,967 |  |  | $ | 22,257,619 |
Total assets |  |  | 68,585,974 |  |  |  | 26,620,589 |  |  |  | 15,522,456 |  |  |  | 26,442,929 |
Current liabilities |  |  | 18,686,181 |  |  |  | 4,749,574 |  |  |  | 5,763,857 |  |  |  | 8,172,750 |
Noncurrent liabilities |  |  | 4,700,458 |  |  |  | — |  |  |  | 1,055,965 |  |  |  | 3,644,493 |
Joint ventures’ equity |  |  | 45,199,335 |  |  |  | 21,871,015 |  |  |  | 8,702,634 |  |  |  | 14,625,686 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 21,461,492 |  |  |  | 10,935,509 |  |  |  | 3,685,404 |  |  |  | 6,840,579 |
Northern Technologies International Corporation's share of joint ventures' undistributed earnings |  | $ | 19,403,150 |  |  | $ | 10,904,604 |  |  | $ | 3,314,445 |  |  | $ | 5,184,101 |
|  | August 31, 2011 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Current assets |  | $ | 66,956,061 |  |  | $ | 24,411,880 |  |  | $ | 14,565,219 |  |  | $ | 27,978,962 |
Total assets |  |  | 73,155,916 |  |  |  | 27,093,874 |  |  |  | 14,759,582 |  |  |  | 31,302,460 |
Current liabilities |  |  | 24,712,555 |  |  |  | 5,145,239 |  |  |  | 6,123,684 |  |  |  | 13,443,632 |
Noncurrent liabilities |  |  | 4,605,837 |  |  |  | — |  |  |  | 1,020,034 |  |  |  | 3,585,803 |
Joint ventures’ equity |  |  | 43,752,524 |  |  |  | 21,948,635 |  |  |  | 7,615,864 |  |  |  | 14,273,025 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 20,559,509 |  |  |  | 10,931,819 |  |  |  | 2,803,194 |  |  |  | 6,824,496 |
Northern Technologies International Corporation's share of joint ventures' undistributed earnings |  | $ | 18,967,125 |  |  | $ | 10,900,914 |  |  | $ | 2,432,235 |  |  | $ | 5,633,976 |
Schedule of Condensed Income Statement [Table Text Block] |
|  | Fiscal Year Ended August 31, 2012 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 111,830,961 |  |  | $ | 36,027,979 |  |  | $ | 22,035,035 |  |  | $ | 53,767,947 |
Gross profit |  |  | 50,679,875 |  |  |  | 18,667,848 |  |  |  | 9,621,930 |  |  |  | 22,390,097 |
Net income |  |  | 11,987,323 |  |  |  | 6,656,298 |  |  |  | 3,585,476 |  |  |  | 1,745,549 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 5,519,794 |  |  | $ | 3,318,213 |  |  | $ | 1,414,248 |  |  | $ | 787,333 |
|  | Fiscal Year Ended August 31, 2011 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 119,276,553 |  |  | $ | 39,038,653 |  |  | $ | 18,938,928 |  |  | $ | 61,298,972 |
Gross profit |  |  | 54,135,274 |  |  |  | 19,080,420 |  |  |  | 8,812,415 |  |  |  | 26,242,439 |
Net income |  |  | 12,221,658 |  |  |  | 6,804,175 |  |  |  | 3,147,978 |  |  |  | 2,269,505 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 5,536,243 |  |  | $ | 3,274,333 |  |  | $ | 1,212,250 |  |  | $ | 1,049,660 |
Fees For Services Provided to Joint Ventures [Member] |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Fiscal 2012 |  |  | % of Total Fees for Services Provided to Joint Ventures in Fiscal 2012 |  |  | Fiscal 2011 |  |  | % of Total Fees for Services Provided to Joint Ventures in Fiscal 2011 |
Japan |  | $ | 1,022,386 |  |  |  | 22.1 | % |  | $ | 1,184,205 |  |  |  | 19.3 | %
Germany |  |  | 994,347 |  |  |  | 21.5 | % |  |  | 1,066,659 |  |  |  | 17.4 | %
Sweden |  |  | 587,069 |  |  |  | 12.7 | % |  |  | 575,271 |  |  |  | 9.4 | %
France |  |  | 517,708 |  |  |  | 11.2 | % |  |  | 727,653 |  |  |  | 11.9 | %
Finland |  |  | 491,988 |  |  |  | 10.6 | % |  |  | 535,913 |  |  |  | 8.7 | %
Poland |  |  | 456,837 |  |  |  | 9.9 | % |  |  | 317,020 |  |  |  | 5.2 | %
United Kingdom |  |  | 309,938 |  |  |  | 6.7 | % |  |  | 306,586 |  |  |  | 5.0 | %
India |  |  | (192,758 | ) |  |  | (4.1 | )% |  |  | 844,147 |  |  |  | 13.8 | %
Other |  |  | 435,398 |  |  |  | 9.4 | % |  |  | 572,525 |  |  |  | 9.3 | %
|  | $ | 4,622,912 |  |  |  | 100.0 | % |  | $ | 6,129,979 |  |  |  | 100.0 | %
Brazil [Member] |
Schedule of Condensed Balance Sheet [Table Text Block] |
| At August 31, 2012
| Brazil |  | North America |  | Total
Total assets | $1,744,693 |  | $40,132,934 |  | $41,877,627
| At August 31, 2011
| Brazil |  | North America |  | Total
Total assets | $1,308,996 |  | $38,730,746 |  | $40,039,742
Schedule of Condensed Income Statement [Table Text Block] |
| Fiscal Year Ended August 31, 2012
| Brazil |  | North America |  | Total
Net sales | $4,783,900 |  | $17,997,753 |  | $22,781,653
Operating income | $1,513,891 |  | $3,055,878 |  | $4,569,769
| Fiscal Year Ended August 31, 2011
| Brazil |  | North America |  | Total
Net sales | $3,530,531 |  | $15,995,996 |  | $19,526,527
Operating income | $708,378 |  | $3,917,059 |  | $4,625,437

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