Note 13 - Stockholders' Equity (Tables)

12 Months Ended

Aug. 31, 2014

Stockholders' Equity Note [Abstract]

Dividend Declaration and Payment Details [Table Text Block]

Declaration Date	Dividends Per Share of Common Stock		Type	Record Date	Total $ Amount (in thousands)		Payment Date
August 14, 2014	$	0.39	Regular (cash)	August 29, 2014	$	16,299	September 16, 2014
May 5, 2014	$	0.39	Regular (cash)	May 30, 2014	$	16,386	June 17, 2014
February 11, 2014	$	0.35	Regular (cash)	February 28, 2014	$	14,827	March 18, 2014
November 14, 2013	$	0.35	Regular (cash)	November 29, 2013	$	15,046	December 17, 2013
August 15, 2013	$	0.35	Regular (cash)	August 31, 2013	$	15,164	September 17, 2013
May 14, 2013	$	0.35	Regular (cash)	May 31, 2013	$	15,413	June 18, 2013
February 21, 2013	$	0.31	Regular (cash)	February 28, 2013	$	13,510	March 19, 2013
November 15, 2012	$	0.31	Regular (cash)	November 30, 2012	$	13,746	December 18, 2012
August 8, 2012	$	0.31	Regular (cash)	August 31, 2012	$	13,727	September 18, 2012
May 8, 2012	$	0.31	Regular (cash)	May 31, 2012	$	13,893	June 19, 2012
February 14, 2012	$	0.27	Regular (cash)	February 29, 2012	$	12,085	March 20, 2012
November 10, 2011	$	0.27	Regular (cash)	November 30, 2011	$	12,181	December 20, 2011