Impairment of Real Estate, Impairment of Unconsolidated Entities and Write-Off of Abandoned Development Projects (Details Textual) (USD $)	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Schedule of Impairment of Real Estate [Line Items]
Impairment of real estate	$ 1,381,000	$ 4,835,000
Impairment of Real Estate, Impairment of Unconsolidated Entities and Write-Off of Abandoned Development Projects (Textual) [Abstract]
Impairment of unconsolidated entities	0	0
Write-off of abandoned development projects	447,000	157,000
Portage, MI [Member]
Schedule of Impairment of Real Estate [Line Items]
Impairment of real estate	1,381,000	3,435,000
Mill Creek [Member]
Schedule of Impairment of Real Estate [Line Items]
Impairment of real estate		$ 1,400,000