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Note 8 - Fair Value Measurements (Details) - Fair Value Measurements of Assets and Liabilities on Recurring Basis - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Money Market Funds [Member]    
Cash equivalents    
Fair value, cash equivalents $ 1,089 $ 2,746
US Government-sponsored Enterprises Debt Securities [Member]    
Short-term marketable securities and time deposits    
Fair value, short-term marketable securities and time deposits   1,499
Long-term marketable securities    
Fair value, long-term marketable securities 23,531 19,552
Corporate Debt Securities [Member]    
Short-term marketable securities and time deposits    
Fair value, short-term marketable securities and time deposits 12,501 7,410
Long-term marketable securities    
Fair value, long-term marketable securities 66,184 72,717
Derivative Financial Instruments, Assets [Member]    
Long-term marketable securities    
Fair value, derivative liabilities (36) (618)
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Cash equivalents    
Fair value, cash equivalents 1,089 2,746
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Short-term marketable securities and time deposits    
Fair value, short-term marketable securities and time deposits   1,499
Long-term marketable securities    
Fair value, long-term marketable securities 23,531 19,552
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]    
Short-term marketable securities and time deposits    
Fair value, short-term marketable securities and time deposits 12,501 7,410
Long-term marketable securities    
Fair value, long-term marketable securities 66,184 72,717
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member]    
Long-term marketable securities    
Fair value, derivative liabilities $ (36) $ (618)