Note 12 - Stockholders' Equity (Tables)

6 Months Ended

Feb. 28, 2018

Notes Tables

Dividends Declared [Table Text Block]

Declaration Date	Dividends Per Share of Common Stock		Type	Record Date	Total $ Amount (in thousands)		Payment Date
February 7, 2018	$	0.56	Regular (cash)	February 28, 2018	$	21,799	March 20, 2018
November 8, 2017	$	0.56	Regular (cash)	November 30, 2017	$	21,902	December 19, 2017
August 10, 2017	$	0.56	Regular (cash)	August 31, 2017	$	21,853	September 19, 2017
May 5, 2017	$	0.56	Regular (cash)	May 31, 2017	$	21,951	June 20, 2017
February 6, 2017	$	0.50	Regular (cash)	February 28, 2017	$	19,709	March 21, 2017
November 10, 2016	$	0.50	Regular (cash)	November 30, 2016	$	19,852	December 20, 2016
August 5, 2016	$	0.50	Regular (cash)	August 31, 2016	$	20,019	September 20, 2016