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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.