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Note 11 - Geographic And Segment Information (Tables) | 6 Months Ended
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Feb. 28, 2013
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | February 28, 2013 |  |  | February 29, 2012 |  |  | February 28, 2013 |  |  | February 29, 2012 |
Inside the U.S.A. to unaffiliated customers |  |  | 65.6 | % |  |  | 58.9 | % |  |  | 68.4 | % |  |  | 63.3 | %
Outside the U.S.A to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint ventures in which the Company is a shareholder directly and indirectly |  |  | 18.2 | % |  |  | 11.9 | % |  |  | 16.8 | % |  |  | 13.7 | %
Unaffiliated customers |  |  | 16.2 | % |  |  | 29.2 | % |  |  | 14.8 | % |  |  | 23.0 | %
|  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | February 28, 2013 |  |  | February 29, 2012 |  |  | February 28, 2013 |  |  | February 29, 2012 |
ZERUST® sales |  | $ | 4,710,412 |  |  | $ | 4,570,779 |  |  | $ | 9,505,695 |  |  | $ | 9,023,425 |
Natur-Tec™ sales |  |  | 535,938 |  |  |  | 403,549 |  |  |  | 1,032,402 |  |  |  | 783,017 |
|  | $ | 5,246,350 |  |  | $ | 4,974,328 |  |  | $ | 10,538,097 |  |  | $ | 9,806,442 |
Reconciliation of Cost of Good Sold from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | February 28, 2013 |  |  | % of Product Sales* |  |  | February 29, 2012 |  |  | % of Product Sales* |  |  | February 28, 2013 |  |  | % of Product Sales* |  |  | February 29, 2012 |  |  | % of Product Sales* |
Direct cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ZERUST® |  | $ | 2,623,070 |  |  |  | 55.7 | % |  | $ | 2,569,588 |  |  |  | 56.2 | % |  | $ | 5,267,365 |  |  |  | 55.4 | % |  | $ | 5,027,387 |  |  |  | 55.7 | %
Natur-Tec® |  |  | 453,147 |  |  |  | 84.6 | % |  |  | 361,704 |  |  |  | 89.6 | % |  |  | 892,820 |  |  |  | 86.5 | % |  |  | 658,265 |  |  |  | 84.1 | %
Indirect cost of goods sold |  |  | 557,696 |  |  |  | — |  |  |  | 548,790 |  |  |  | — |  |  |  | 1,164,700 |  |  |  | — |  |  |  | 1,003,906 |  |  |  | — |
Total net cost of goods sold |  | $ | 3,633,913 |  |  |  |  |  |  | $ | 3,480,082 |  |  |  |  |  |  | $ | 7,324,885 |  |  |  |  |  |  | $ | 6,689,558 |  |  |  |  |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | At February 28, 2013 |
|  | Brazil |  |  | North America |  |  | Total |
Total assets |  | $ | 1,456,793 |  |  | $ | 43,982,614 |  |  | $ | 45,439,407 |
|  | At August 31, 2012 |
|  | Brazil |  |  | North America |  |  | Total |
Total assets |  | $ | 1,744,693 |  |  | $ | 40,132,934 |  |  | $ | 41,877,627 |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Six Months Ended February 28, 2013 |
|  | Brazil |  |  | North America |  |  | Total |
Net sales |  | $ | 1,131,469 |  |  | $ | 9,406,628 |  |  | $ | 10,538,097 |
Operating income |  | $ | (106,759 | ) |  | $ | 1,950,278 |  |  | $ | 1,843,519 |
|  | Six Months Ended February 29, 2012 |
|  | Brazil |  |  | North America |  |  | Total |
Net sales |  | $ | 1,216,532 |  |  | $ | 8,589,910 |  |  | $ | 9,806,442 |
Operating income |  | $ | (173,651 | ) |  | $ | 1,897,972 |  |  | $ | 1,724,321 |
Fees For Services Provided to Joint Ventures [Member] |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended |
|  | February 28, 2013 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | February 29, 2012 |  |  | % of Total Fees for Services Provided to Joint Ventures |
China* |  | $ | 450,586 |  |  |  | 25.4 | % |  | $ | — |  |  |  | 0.0 | %
Germany |  |  | 249,513 |  |  |  | 14.1 | % |  |  | 251,387 |  |  |  | 19.4 | %
Japan |  |  | 169,205 |  |  |  | 9.6 | % |  |  | 214,984 |  |  |  | 16.6 | %
Poland |  |  | 154,839 |  |  |  | 8.7 | % |  |  | 130,470 |  |  |  | 10.1 | %
Thailand* |  |  | 148,303 |  |  |  | 8.4 | % |  |  | — |  |  |  | 0.0 | %
France |  |  | 147,896 |  |  |  | 8.3 | % |  |  | 127,004 |  |  |  | 9.8 | %
Korea** |  |  | 123,388 |  |  |  | 7.0 | % |  |  | 532 |  |  |  | 0.0 | %
Sweden |  |  | 77,627 |  |  |  | 4.4 | % |  |  | 148,277 |  |  |  | 11.4 | %
Finland |  |  | 72,329 |  |  |  | 4.1 | % |  |  | 118,911 |  |  |  | 9.2 | %
United Kingdom |  |  | 35,754 |  |  |  | 2.0 | % |  |  | 80,639 |  |  |  | 6.2 | %
India |  |  | — |  |  |  | 0.0 | % |  |  | 163,689 |  |  |  | 12.6 | %
Other |  |  | 141,441 |  |  |  | 8.0 | % |  |  | 62,233 |  |  |  | 4.8 | %
|  | $ | 1,770,881 |  |  |  | 100.0 | % |  | $ | 1,298,126 |  |  |  | 100.0 | %
|  | Six Months Ended |
|  | February 28, 2013 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | February 29, 2012 |  |  | % of Total Fees for Services Provided to Joint Ventures |
China* |  | $ | 943,897 |  |  |  | 26.1 | % |  | $ | — |  |  |  | 0.0 | %
Germany |  |  | 492,213 |  |  |  | 13.6 | % |  |  | 500,833 |  |  |  | 18.3 | %
Japan |  |  | 371,186 |  |  |  | 10.3 | % |  |  | 503,522 |  |  |  | 18.4 | %
Thailand* |  |  | 301,989 |  |  |  | 8.4 | % |  |  | — |  |  |  | 0.0 | %
France |  |  | 276,398 |  |  |  | 7.6 | % |  |  | 268,643 |  |  |  | 9.8 | %
Poland |  |  | 266,311 |  |  |  | 7.4 | % |  |  | 228,298 |  |  |  | 8.3 | %
Korea** |  |  | 262,131 |  |  |  | 7.2 | % |  |  | 76,997 |  |  |  | 2.8 | %
Sweden |  |  | 164,619 |  |  |  | 4.6 | % |  |  | 304,934 |  |  |  | 11.1 | %
Finland |  |  | 160,180 |  |  |  | 4.4 | % |  |  | 251,407 |  |  |  | 9.2 | %
United Kingdom |  |  | 102,812 |  |  |  | 2.8 | % |  |  | 160,138 |  |  |  | 5.8 | %
India |  |  | — |  |  |  | 0.0 | % |  |  | 299,844 |  |  |  | 10.9 | %
Other |  |  | 275,422 |  |  |  | 7.6 | % |  |  | 148,762 |  |  |  | 5.4 | %
|  | $ | 3,617,158 |  |  |  | 100.0 | % |  | $ | 2,743,378 |  |  |  | 100.0 | %

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