Note 9 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]
Marketable Securities		$ 4,100		$ 5,900
Fair Value, Inputs, Level 3 [Member]
Marketable Securities		1,700		1,700
Discontinued Operations [Member]
Asset Impairment Charges			$ 100
Marketable Securities	[1]	5,716		$ 7,565
Asset Impairment Charges		$ 5,840	$ 6,473

[1] As of March 31, 2016 and December 31, 2015, the Company determined that $4.1 million and $5.9 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $1.7 million and $1.7 million, respectively, were classified within Level 3 of the fair value hierarchy.