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Note 18 - Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Income from Operations by Geographic Area [Table Text Block] |
|  | Year Ended December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Income from Operations: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 120,641 |  |  | $ | 103,136 |  |  | $ | 89,308 |
Europe |  |  | 16,804 |  |  |  | 12,846 |  |  |  | 11,657 |
Corporate Unallocated and Japan |  |  | (48,547 | ) |  |  | (43,756 | ) |  |  | (39,198 | )
Total income from operations |  | $ | 88,898 |  |  | $ | 72,226 |  |  | $ | 61,767 |
Long-lived Assets by Geographic Areas [Table Text Block] |
|  | December 31, |  |  | December 31, |  |  | December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Long-lived assets: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 185,979 |  |  | $ | 125,308 |  |  | $ | 108,650 |
Europe |  |  | 34,577 |  |  |  | 33,691 |  |  |  | 23,199 |
Japan |  |  | 7,445 |  |  |  | 7,441 |  |  |  | 7,625 |
Total long-lived assets |  | $ | 228,001 |  |  | $ | 166,440 |  |  | $ | 139,474 |
Expenditures for Additions to Long-lived Assets by Geographic Region [Table Text Block] |
|  | Year Ended December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Expenditures for additions to long-lived assets: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 78,762 |  |  | $ | 20,370 |  |  | $ | 21,190 |
Europe |  |  | 7,576 |  |  |  | 11,704 |  |  |  | 5,954 |
Japan |  |  | 766 |  |  |  | 561 |  |  |  | 6,472 |
Total expenditures for additions to long-lived assets |  | $ | 87,104 |  |  | $ | 32,635 |  |  | $ | 33,616 |
Depreciation and Amortization by Geographic Region [Table Text Block] |
|  | Year Ended December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 21,117 |  |  | $ | 13,267 |  |  | $ | 12,533 |
Europe |  |  | 4,679 |  |  |  | 4,174 |  |  |  | 3,386 |
Japan |  |  | 958 |  |  |  | 1,033 |  |  |  | 1,566 |
Total depreciation and amortization |  | $ | 26,754 |  |  | $ | 18,474 |  |  | $ | 17,485 |
Operating Segments [Member] |
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Year Ended December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 350,535 |  |  | $ | 263,086 |  |  | $ | 223,930 |
Europe |  |  | 80,889 |  |  |  | 70,154 |  |  |  | 63,365 |
Japan |  |  | 14,172 |  |  |  | 11,250 |  |  |  | 10,760 |
Total revenue |  | $ | 445,596 |  |  | $ | 344,490 |  |  | $ | 298,055 |

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