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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.

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