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Note 2 - Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment Estimated Useful Life [Table Text Block]
     
%
 
  
Computer equipment  
 
33
 
Office furniture and equipment  
7
 -
15
Leasehold improvements  
 
Over the shorter of the  lease term or estimated useful life 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Year ended December 31,
    2016   2015   2014
Dividend yield    
0
 %  
 
0%
 
  
 
0%
 
Expected volatility    
62.1
 %  
 
65%
 
  
60%
-
64%
Risk-free interest    
1.42
 %  
1.94
 -
2.00%
  
1.97
-
2.30%
Expected life    
6.25
    
 
6.25
 
  
 
6.25
 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
 
 
Liabilities as of
December 31, 2016
 
Liabilities as of
December 31, 2015
 
 
Notional
Amount
 
Fair
Value
 
Notional
Amount
 
Fair
Value
Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships—included in accrued expenses and other liabilities   $
46,116
     $
(479
 )   $
36,070
     $
(331
 )