Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Components Of Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income balance, beginning of period			$ 9,382,334
Other comprehensive income (loss):
Tax provision included in accrued liabilities	0	0	0	4,414
Other comprehensive income (loss)	1,194,983	796,836	3,766,295	764,968
Accumulated other comprehensive income balance, end of period	13,148,629	9,184,292	13,148,629	9,184,292
Available-for-sale Securities [Member]
Components Of Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income balance, beginning of period	11,953,646	8,387,456	9,382,334	8,411,128
Other comprehensive income (loss):
Unrealized gains, net of taxes of $-0- for all periods presented	1,194,983	796,836	3,766,295	2,972,664
Reclassification adjustments for gains included in rent and other income	0	0	0	(2,199,500)
Tax provision	0	0	0	0
Amount reclassified from accumulated other comprehensive income	0	0	0	(2,199,500)
Other comprehensive income (loss)	1,194,983	796,836	3,766,295	773,164
Accumulated other comprehensive income balance, end of period	13,148,629	9,184,292	13,148,629	9,184,292
Foreign currency translation adjustment [Member]
Components Of Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income balance, beginning of period	0	0	0	8,196
Other comprehensive income (loss):
Unrealized gains (losses)	0	0	0	0
Reclassification adjustments for gains included in rent and other income	0	0	0	(12,610)
Tax provision included in accrued liabilities	0	0	0	4,414
Amount reclassified from accumulated other comprehensive income	0	0	0	(8,196)
Other comprehensive income (loss)	0	0	0	(8,196)
Accumulated other comprehensive income balance, end of period	$ 0	$ 0	$ 0	$ 0