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Note 16 - Segment and Related Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Year Ended December 31, |
(in thousands) |  | 2020 |  |  | 2019 |
United States |  | $ | 42,054 |  |  | $ | 47,792 |
Europe |  |  | 29,938 |  |  |  | 35,128 |
Asia |  |  | 23,884 |  |  |  | 25,041 |
Rest of the world |  |  | 6,224 |  |  |  | 8,215 |
Total revenues |  | $ | 102,100 |  |  | $ | 116,176 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | December 31, |
(in thousands) |  | 2020 |  |  | 2019 |
United States |  | $ | 36,568 |  |  | $ | 41,993 |
Germany |  |  | 4,958 |  |  |  | 5,468 |
Rest of the world |  |  | 3,092 |  |  |  | 3,048 |
Total long-lived assets (a) |  | $ | 44,618 |  |  | $ | 50,509 |
Schedule of Net Assets By Geographic Areas [Table Text Block] |
|  | December 31, |
(in thousands) |  | 2020 |  |  | 2019 |
United States |  | $ | 32,457 |  |  | $ | 37,726 |
Germany |  |  | 18,697 |  |  |  | 17,340 |
United Kingdom |  |  | 8,867 |  |  |  | 11,254 |
Rest of the world |  |  | 16,660 |  |  |  | 15,374 |
Total net assets |  | $ | 76,681 |  |  | $ | 81,694 |

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