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Note 7 - Fair Value Measurements (Detail) - Assets at Fair Values (Fair Value, Inputs, Level 1 [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
   
Investment in Global (1) $ 23,607 [1] $ 19,913 [1]
[1] Global's ordinary shares are publicly traded on the Alternative Investment Market ("AIM"), a market operated by the London Stock Exchange, with quoted prices in active markets. Accordingly, the fair value measurements of these securities have been classified as Level 1.