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Note 11 - Fair Value Measurements (Details) - Fair Value Measurements of Assets and Liabilities on Recurring Basis - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Long-term marketable securities:    
Derivative liabilities $ (75) $ (618)
Fair Value, Measurements, Recurring [Member]    
Long-term marketable securities:    
Derivative liabilities (75) (618)
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Short-term marketable securities and cash deposits:    
Available For Sale Securities Debt Securities Current 1,509 1,499
Long-term marketable securities:    
Available For Sale Securities Debt Securities Noncurrent 22,124 19,552
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Short-term marketable securities and cash deposits:    
Available For Sale Securities Debt Securities Current 13,610 7,410
Long-term marketable securities:    
Available For Sale Securities Debt Securities Noncurrent 64,138 72,717
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member]    
Cash equivalents:    
Money market mutual funds 2,302 2,746
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member]    
Cash equivalents:    
Money market mutual funds 2,302 2,746
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Long-term marketable securities:    
Derivative liabilities (75) (618)
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Short-term marketable securities and cash deposits:    
Available For Sale Securities Debt Securities Current 1,509 1,499
Long-term marketable securities:    
Available For Sale Securities Debt Securities Noncurrent 22,124 19,552
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Short-term marketable securities and cash deposits:    
Available For Sale Securities Debt Securities Current 13,610 7,410
Long-term marketable securities:    
Available For Sale Securities Debt Securities Noncurrent $ 64,138 $ 72,717