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Note 12 - Segment Reporting (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Income from Operations by Geographic Area [Table Text Block]
                                 
   

Three Months Ended June 30,

   

Six Months Ended June 30,

 

(in thousands)

 

2019

   

2018

   

2019

   

2018

 

Income from Operations:

                               

United States

  $ 27,948     $ 29,256     $ 54,258     $ 58,099  

Europe

    3,756       4,009       7,977       7,371  

Corporate Unallocated and Japan

    (12,131 )     (11,281 )     (23,214 )     (21,758 )

Total Income from Operations

  $ 19,573     $ 21,984     $ 39,021     $ 43,712  
                                 
Long-lived Assets by Geographic Areas [Table Text Block]
                 
   

June 30,

   

December 31,

 

(in thousands)

 

2019

   

2018

 

Total long-lived assets:

               

United States

  $ 200,709     $ 185,979  

Europe

    40,027       34,577  

Japan

    8,080       7,445  

Total Assets

  $ 248,816     $ 228,001  
                 
Operating Segments [Member]  
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
                                 
   

Three Months Ended June 30,

   

Six Months Ended June 30,

 

(in thousands)

 

2019

   

2018

   

2019

   

2018

 

Revenue:

                               

United States

  $ 91,149     $ 86,354     $ 178,960     $ 170,521  

Europe

    20,940       20,213       42,194       40,158  

Japan

    3,843       3,085       8,230       6,718  

Total revenue

  $ 115,932     $ 109,652     $ 229,384     $ 217,397