Earnings per Share (Details Textual) - shares	3 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	40,000	40,000
Series A Cumulative Convertible Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion	36,000	36,000