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Note 12 - Geographic and Segment Information (Details) - Net Sales by Segment (USD $) | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Aug. 31, 2014 | May 31, 2014 | Feb. 28, 2014 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Aug. 31, 2014 | Aug. 31, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 7,377,180 | $ 6,920,820 | $ 6,219,008 | $ 6,086,734 | $ 5,877,033 | $ 5,246,350 | $ 26,826,108 | $ 22,501,864 | $ 6,309,100 | $ 5,291,747
Change in $ |  |  |  |  |  |  | 4,324,244 |  |  |
Change in % |  |  |  |  |  |  | 19.20% |  |  |
ZERUST [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | 23,845,288 | 20,457,198 |  |
Change in $ |  |  |  |  |  |  | 3,388,090 |  |  |
Change in % |  |  |  |  |  |  | 16.60% |  |  |
Natur-Tec [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | 2,980,820 | 2,044,666 |  |
Change in $ |  |  |  |  |  |  | $ 936,154 |  |  |
Change in % |  |  |  |  |  |  | 45.80% |  |  |

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