Note 13 - Net Sales by Geographic Location as Percentage of Total Consolidated Net Sales (Details) - USD ($)	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Geographic Concentration Risk [Member] | Inside the USA to Unaffiliated Customers [Member] | Percentage of Total Consolidated Net Sales [Member ]
Inside the U.S.A. to unaffiliated customers	$ 19,329,979	$ 17,908,563	$ 16,027,619
Geographic Concentration Risk [Member] | Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member] | Percentage of Total Consolidated Net Sales [Member ]
Inside the U.S.A. to unaffiliated customers	3,240,980	3,348,158	2,952,612
Geographic Concentration Risk [Member] | Unaffiliated Customers Outside the USA [Member] | Percentage of Total Consolidated Net Sales [Member ]
Inside the U.S.A. to unaffiliated customers	7,751,734	5,569,387	3,521,633
Inside the U.S.A. to unaffiliated customers	$ 30,322,693	$ 26,826,108	$ 22,501,864