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Note 10 - Revenues (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Instruments, equipment, software and accessories |  | $ | 27,765 |  |  | $ | 27,992 |  |  | $ | 55,303 |  |  | $ | 53,819 |
Service, maintenance and warranty contracts |  |  | 1,443 |  |  |  | 1,205 |  |  |  | 2,683 |  |  |  | 2,367 |
Total revenues |  | $ | 29,208 |  |  | $ | 29,197 |  |  | $ | 57,986 |  |  | $ | 56,186 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
United States |  | $ | 14,075 |  |  | $ | 13,151 |  |  | $ | 26,314 |  |  | $ | 24,328 |
Europe |  |  | 7,194 |  |  |  | 8,026 |  |  |  | 15,017 |  |  |  | 16,615 |
Asia |  |  | 5,618 |  |  |  | 5,695 |  |  |  | 12,351 |  |  |  | 11,233 |
Rest of the world |  |  | 2,321 |  |  |  | 2,325 |  |  |  | 4,304 |  |  |  | 4,010 |
Total revenues |  | $ | 29,208 |  |  | $ | 29,197 |  |  | $ | 57,986 |  |  | $ | 56,186 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | June 30, |  |  | December 31, |
(in thousands) |  | 2022 |  |  | 2021 |
Service contracts |  | $ | 1,653 |  |  | $ | 1,976 |
Customer advances |  |  | 1,959 |  |  |  | 2,290 |
Total deferred revenue |  | $ | 3,612 |  |  | $ | 4,266 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Six Months Ended June 30, |
(in thousands) |  | 2022 |  |  | 2021 |
Balance, beginning of period |  | $ | 136 |  |  | $ | 227 |
Bad debt (credit) expense |  |  | 107 |  |  |  | (17 | )
Charge-offs and other |  |  | (48 | ) |  |  | (65 | )
Balance, end of period |  | $ | 195 |  |  | $ | 145 |

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