Note 12 - Fair Value Measurements (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Marketable Securities	$ 76,786,000	[1]		$ 36,541,000	[1]
Impairment of Real Estate	3,200,000		9,600,000
Segment, Discontinued Operations [Member]
Impairment of Real Estate			9,300,000
Fair Value, Inputs, Level 1 [Member]
Marketable Securities	73,800,000			33,400,000
Fair Value, Inputs, Level 3 [Member]
Marketable Securities	$ 3,300,000			$ 3,400,000

[1] As of March 31, 2013 and December 31, 2012, the Company determined that $73.8 million and $22.4 million, respectively, of the marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $3.3 million and $3.4 million, respectively, were classified within Level 3 of the fair value hierarchy.