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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
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.