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Note 12 - Geographic And Segment Information (Details) - Net Sales By Segment (USD $)	3 Months Ended				12 Months Ended
	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2013	Aug. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 6,086,734	$ 5,877,033	$ 5,246,350	$ 5,291,747	$ 22,501,864	$ 22,781,653
Change in $					(279,789)
Change in %					(1.20%)
ZERUST [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales					20,457,198	20,971,275
Change in $					(514,077)
Change in %					(2.50%)
Natur-Tec [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales					2,044,666	1,810,378
Change in $					$ 234,288
Change in %					12.90%