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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended			6 Months Ended		12 Months Ended
	Oct. 31, 2015 USD ($) shares	Jul. 31, 2015 USD ($) Property	Oct. 31, 2014 USD ($)	Oct. 31, 2015 USD ($) Property Redemption shares	Oct. 31, 2014 USD ($) Property	Apr. 30, 2015 USD ($) Property
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Interest in operating partnership	89.80%			89.80%		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			1,000
Period to hold the beneficial interest, minimum				1 year
Real Estate Properties [Line Items]
Impairment of property				$ 3,598,000	$ 5,565,000
Impairment of real estate investments	$ 1,873,000		$ 1,803,000	3,158,000	4,123,000
Impairment included in discontinued operations				$ 440,000	$ 0
Number of impairment properties \| Property				2	2
Held For Sale [Line Items]
Number of properties \| Property				21		68
Assets held for sale	115,428,000			$ 115,428,000		$ 463,103,000
Liabilities held for sale	145,565,000			145,565,000		$ 321,393,000
Compensating Balances [Line Items]
Compensating balances	13,435,000			$ 13,435,000
Remaining terms of certificates of deposit				1 year
Decrease in lender holdbacks				$ 3,258,000	$ 4,840,000
Increase in lender holdbacks				578,000	621,000
Discontinued Operations [Member]
Real Estate Properties [Line Items]
Impairment of real estate investments	0		$ 1,442,000	$ 440,000	1,442,000
Office Properties [Member] \| Held for Sale [Member]
Held For Sale [Line Items]
Number of properties \| Property				9		49
Retail Properties [Member] \| Held for Sale [Member]
Held For Sale [Line Items]
Number of properties \| Property				3		17
Healthcare Properties [Member] \| Held for Sale [Member]
Held For Sale [Line Items]
Number of properties \| Property				1		2
Multifamily [Member] \| Held for Sale [Member]
Held For Sale [Line Items]
Number of properties \| Property				8
Eden Prairie, Minnesota, Office Property [Member]
Real Estate Properties [Line Items]
Impairment of property				$ 440,000
Number of impairment properties \| Property				1
Eden Prairie, Minnesota, Office Property [Member] \| Discontinued Operations [Member]
Real Estate Properties [Line Items]
Impairment of real estate investments				$ 440,000
Grand Chute, Wisconsin, Parcel of Land [Member]
Real Estate Properties [Line Items]
Impairment of property		$ 1,285,000
Number of impairment properties \| Property		1
St. Cloud, Minnesota, Multifamily Properties [Member]
Real Estate Properties [Line Items]
Impairment of property				$ 1,900,000
Number of impairment properties \| Property				8
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
Minneapolis, Minnesota, Office Property [Member]
Real Estate Properties [Line Items]
Impairment of property				$ 1,800,000
Number of impairment properties \| Property				1
Boise, Idaho, Office Property [Member]
Real Estate Properties [Line Items]
Impairment of property				$ 1,400,000
Number of impairment properties \| Property				1
First International Bank, Watford City, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	6,000,000			$ 6,000,000
Private Bank, Minneapolis, Minnesota [Member]
Compensating Balances [Line Items]
Compensating balances	2,000,000			2,000,000
Associated Bank, Green Bay, Wisconsin [Member]
Compensating Balances [Line Items]
Compensating balances	3,000,000			3,000,000
American National Bank, Omaha, Nebraska [Member]
Compensating Balances [Line Items]
Compensating balances	200,000			200,000
Dacotah Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	350,000			350,000
United Community Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	275,000			275,000
Peoples State Bank of Velva, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	225,000			225,000
Commerce Bank, a Minnesota Banking Corporation [Member]
Compensating Balances [Line Items]
Compensating balances	100,000			100,000
Bremer Bank, Saint Paul, Minnesota [Member]
Compensating Balances [Line Items]
Compensating balances	1,285,000			1,285,000
United Community and Dacotah Bank [Member] \| Other Investments [Member]
Compensating Balances [Line Items]
Certificates of deposit	$ 329,000			$ 329,000