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Note 12 - Geographic And Segment Information (Detail) - Geographical Distribution of Key Income Statement Data for Brazil: (USD $) | 3 Months Ended | 12 Months Ended
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Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2012 | Aug. 31, 2011
Net sales | $ 5,170,307 | $ 7,804,904 | $ 4,974,328 | $ 4,832,114 | $ 5,549,190 | [1] | $ 5,100,778 | $ 4,778,118 | $ 4,098,441 | $ 22,781,653 | $ 19,526,527
Operating income |  |  |  |  |  |  |  |  |  | 4,569,769 | 4,625,437
Brazil [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 4,783,900 | 3,530,531
Operating income |  |  |  |  |  |  |  |  |  | 1,513,891 | 708,378
North America [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 17,997,753 | 15,995,996
Operating income |  |  |  |  |  |  |  |  |  | $ 3,055,878 | $ 3,917,059
[1] | During the fourth quarter of fiscal 2010, the Company decided to consolidate the financial results of the Company's majority owned Brazilian subsidiary, Zerust Prevencao de Corrosao S.A., for the fiscal year ended August 31, 2010. As a result, all revenues and expenses of Zerust Brazil for the fiscal year ended August 31, 2010 are included in the fourth quarter of fiscal 2010.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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