Note 3 - Discontinued Operations (Details) (USD $)	9 Months Ended					9 Months Ended				9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013 sqft		Dec. 31, 2012	Sep. 30, 2013 Assets Held-for-sale [Member] Operating Properties [Member]	Sep. 30, 2013 Assets Held-for-sale [Member] Three Operating Properties [Member]	Sep. 30, 2013 Assets Held-for-sale [Member] Remaining [Member]	Sep. 30, 2013 Assets Held-for-sale [Member] sqft	Dec. 31, 2012 Operating Properties [Member] Sold [Member]	Sep. 30, 2013 Operating Properties [Member]
Note 3 - Discontinued Operations (Details) [Line Items]
Number of Real Estate Properties		22			8			3	1
(in Square Feet)		2,474,000	[1]					850,997
Real Estate Held-for-sale		$ 64,600,000					$ 108,000,000
Real Estate Investment Property, Accumulated Depreciation		1,864,904,000		1,745,462,000			11,100,000	5,700,000
Impairment of Real Estate	37,700,000					15,200,000				31,700,000
Fair Value Of Real Estate		$ 302,702,000		$ 52,505,000		$ 93,000,000

[1] Gross leasable area ("GLA")