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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended		12 Months Ended
	Jul. 31, 2015 USD ($) Property Redemption shares	Jul. 31, 2014 USD ($) Property	Apr. 30, 2015 USD ($) Property
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Interest in operating partnership (in hundredths)	90.00%		89.90%
Redemption basis	one-for-one
Redemptions by limited partner, maximum \| Redemption	2
Number of units to redeem, minimum (in units) \| shares	1,000
Period to hold the beneficial interest, minimum	1 year
Real Estate Properties [Line Items]
Impairment of property	$ 1,725,000	$ 2,320,000
Impairment of real estate investments	$ 1,285,000	$ 2,320,000
Number of impairment properties \| Property	2	2
Held For Sale [Line Items]
Assets held for sale	$ 453,217,000		$ 463,103,000
Liabilities held for sale	308,812,000		$ 321,393,000
Compensating Balances [Line Items]
Compensating balances	$ 14,200,000
Remaining terms of certificates of deposit	1 year
Decrease in lender holdbacks	$ 1,354,000	$ 609,000
Increase in lender holdbacks	$ 292,000	326,000
Office Properties [Member]
Held For Sale [Line Items]
Number of properties \| Property	48
Retail Properties [Member]
Held For Sale [Line Items]
Number of properties \| Property	17
Healthcare Properties [Member]
Held For Sale [Line Items]
Number of properties \| Property	2
Eden Prairie, Minnesota, Office Property [Member]
Real Estate Properties [Line Items]
Impairment of property	$ 440,000
Number of impairment properties \| Property	1
Grand Chute, Wisconsin, Parcel of Land [Member]
Real Estate Properties [Line Items]
Impairment of property	$ 1,285,000
Number of impairment properties \| Property	1
Kalispell, Montana, Retail Property [Member]
Real Estate Properties [Line Items]
Impairment of property		$ 2,100,000
Number of impairment properties \| Property		1
Golden Valley, Minnesota, Office Property [Member]
Real Estate Properties [Line Items]
Impairment of property		$ 183,000
Number of impairment properties \| Property		1
Discontinued Operations [Member]
Real Estate Properties [Line Items]
Impairment of real estate investments	$ 440,000	$ 0
Discontinued Operations [Member] \| Eden Prairie, Minnesota, Office Property [Member]
Real Estate Properties [Line Items]
Impairment of real estate investments	$ 440,000
Held for Sale [Member] \| Office Properties [Member]
Held For Sale [Line Items]
Number of properties \| Property	48		49
Held for Sale [Member] \| Retail Properties [Member]
Held For Sale [Line Items]
Number of properties \| Property	17		17
Held for Sale [Member] \| Healthcare Properties [Member]
Held For Sale [Line Items]
Number of properties \| Property	2		2
First International Bank, Watford City, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	$ 6,000,000
Private Bank, Minneapolis, Minnesota [Member]
Compensating Balances [Line Items]
Compensating balances	2,000,000
Associated Bank, Green Bay, Wisconsin [Member]
Compensating Balances [Line Items]
Compensating balances	3,600,000
American National Bank, Omaha, Nebraska [Member]
Compensating Balances [Line Items]
Compensating balances	400,000
Dacotah Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	350,000
United Community Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	275,000
Peoples State Bank of Velva, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	225,000
Commerce Bank, a Minnesota Banking Corporation [Member]
Compensating Balances [Line Items]
Compensating balances	100,000
Bremer Bank, Saint Paul, Minnesota [Member]
Compensating Balances [Line Items]
Compensating balances	1,300,000
United Community and Dacotah Bank [Member] \| Other Investments [Member]
Compensating Balances [Line Items]
Certificates of deposit	$ 329,000