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Note 18 - Quarterly Information (Unaudited) (Detail) - Quarterly Information (Unaudited): (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
Fiscal year 2012: |  |  |  |  |  |  |  |  |  |  |
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
Gross profit | 1,474,594 | 3,661,390 | 1,494,246 | 1,622,638 | 1,936,338 | [1] | 1,641,927 | 1,771,886 | 1,407,736 | 8,252,868 | 6,757,887
Income before income tax expense | 416,611 | 2,454,623 | 703,991 | 1,041,421 | 1,293,640 | [1] | 1,250,155 | 1,141,219 | 1,016,874 | 4,616,646 | 4,701,888
Income tax expense | (32,000) | 814,000 | 100,000 | 106,000 | 216,000 | [1] | 228,000 | 140,000 | 122,000 | 1,041,000 | 706,000
Net income | $ 448,611 | $ 1,640,623 | $ 603,991 | $ 935,421 | $ 1,077,640 | [1] | $ 1,022,155 | $ 1,001,219 | $ 894,874 | $ 3,575,646 | $ 3,995,888
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.10 | $ 0.33 | $ 0.14 | $ 0.22 | $ 0.25 | [1] | $ 0.24 | $ 0.22 | $ 0.21 | $ 0.79 | $ 0.90
Diluted (in Dollars per share) | $ 0.10 | $ 0.33 | $ 0.14 | $ 0.22 | $ 0.24 | [1] | $ 0.23 | $ 0.22 | $ 0.21 | $ 0.78 | $ 0.89
Weighted average common shares assumed outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in Shares) | 4,403,656 | 4,399,290 | 4,398,356 | 4,355,666 | 4,352,558 |  | 4,343,601 | 4,340,934 | 4,264,187 | 4,391,424 | 4,325,863
Diluted (in Shares) | 4,436,444 | 4,461,044 | 4,466,435 | 4,433,724 | 4,442,452 |  | 4,427,097 | 4,419,921 | 4,324,757 | 4,451,594 | 4,404,100
[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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