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Note 4 - Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]    
Investments, Fair Value Disclosure $ 2,678 $ 26,321
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 0 $ 0