Consolidated Statements of Changes in Deficit (USD $)	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total Greystone Stockholders' Deficit	Variable Interest Entities
Balances at May. 31, 2011	$ (9,704,991)		$ 2,611	$ 48,089,298	$ (62,297,986)	$ (14,206,077)	$ 4,501,086
Balances (in shares) at May. 31, 2011			26,111,201
Adjustment for deconsolidating variable interest entities	990,376	5		4,999,995	(391,425)	4,608,575	(3,618,199)
Adjustment for deconsolidating variable interest entities (in shares)		50,000
Capital contributions	75,000						75,000
Cash distributions	(63,672)						(63,672)
Preferred dividends	(242,192)				(242,192)	(242,192)
Net income	2,491,650				2,345,460	2,345,460	146,190
Balances at May. 31, 2012	(6,453,829)	5	2,611	53,089,293	(60,586,143)	(7,494,234)	1,040,405
Balances (in shares) at May. 31, 2012		50,000	26,111,201
Preferred dividends	(326,781)				(326,781)	(326,781)
Net income	2,793,210				2,591,658	2,591,658	201,552
Stock based compensation	53,424			53,424		53,424
Cash distributions	(102,079)						(102,079)
Balances at May. 31, 2013	$ (4,036,055)	$ 5	$ 2,611	$ 53,142,717	$ (58,321,266)	$ (5,175,933)	$ 1,139,878
Balances (in shares) at May. 31, 2013		50,000	26,111,201