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Note 15 - Income Taxes (Detail) - Reconciliations of the Expected Federal Income Tax at the Statutory Rate With the Provisions For Income Taxes: (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
Tax computed at statutory rates										$ 1,570,000	$ 1,692,000
State income tax, net of federal benefit										(17,000)	46,000
Tax effect on equity in income (loss) of international joint ventures										(1,616,000)	(1,705,000)
Tax effect on dividends received from joint ventures										1,363,000	1,229,000
Benefit of foreign operations										556,000	119,000
Foreign tax credit										(1,729,000)	(1,440,000)
Research and development credit										(330,000)	(205,000)
Valuation allowance										1,177,000	896,000
Other										67,000	74,000
	$ (32,000)	$ 814,000	$ 100,000	$ 106,000	$ 216,000	[1]	$ 228,000	$ 140,000	$ 122,000	$ 1,041,000	$ 706,000
[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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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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