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Note 11 - Fair Value Measurements (Details) - Fair Value Measurements of Assets and Liabilities on Recurring Basis - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Money Market Funds [Member]    
Cash equivalents:    
Fair value, cash equivalents $ 1,444 $ 1,089
US Government-sponsored Enterprises Debt Securities [Member]    
Short-term marketable securities and cash deposits:    
Fair value, short-term marketable securities and time deposits 375  
Long-term marketable securities:    
Fair value, long-term marketable securities 22,152 23,531
Corporate Debt Securities [Member]    
Short-term marketable securities and cash deposits:    
Fair value, short-term marketable securities and time deposits 12,979 12,501
Long-term marketable securities:    
Fair value, long-term marketable securities 63,750 66,184
Derivative Financial Instruments, Assets [Member]    
Long-term marketable securities:    
Derivative Assets 162  
Derivative Financial Instruments, Liabilities [Member]    
Long-term marketable securities:    
Derivative liabilities   (36)
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Cash equivalents:    
Fair value, cash equivalents 1,444 1,089
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Short-term marketable securities and cash deposits:    
Fair value, short-term marketable securities and time deposits 375  
Long-term marketable securities:    
Fair value, long-term marketable securities 22,152 23,531
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]    
Short-term marketable securities and cash deposits:    
Fair value, short-term marketable securities and time deposits 12,979 12,501
Long-term marketable securities:    
Fair value, long-term marketable securities 63,750 66,184
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member]    
Long-term marketable securities:    
Derivative Assets $ 162  
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]    
Long-term marketable securities:    
Derivative liabilities   $ (36)