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Note 10 - Revenues (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Instruments, equipment, software and accessories |  | $ | 25,705 |  |  | $ | 28,485 |  |  | $ | 81,008 |  |  | $ | 82,304 |
Service, maintenance and warranty contracts |  |  | 1,217 |  |  |  | 1,178 |  |  |  | 3,900 |  |  |  | 3,545 |
Total revenues |  | $ | 26,922 |  |  | $ | 29,663 |  |  | $ | 84,908 |  |  | $ | 85,849 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
United States |  | $ | 11,511 |  |  | $ | 12,709 |  |  | $ | 38,278 |  |  | $ | 37,300 |
Europe |  |  | 7,344 |  |  |  | 8,366 |  |  |  | 22,361 |  |  |  | 25,569 |
Asia |  |  | 6,730 |  |  |  | 7,161 |  |  |  | 19,080 |  |  |  | 18,588 |
Rest of the world |  |  | 1,337 |  |  |  | 1,427 |  |  |  | 5,189 |  |  |  | 4,392 |
Total revenues |  | $ | 26,922 |  |  | $ | 29,663 |  |  | $ | 84,908 |  |  | $ | 85,849 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | September 30, |  |  | December 31, |
(in thousands) |  | 2022 |  |  | 2021 |
Service contracts |  | $ | 1,642 |  |  | $ | 1,976 |
Customer advances |  |  | 2,000 |  |  |  | 2,290 |
Total deferred revenue |  | $ | 3,642 |  |  | $ | 4,266 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Nine Months Ended September 30, |
(in thousands) |  | 2022 |  |  | 2021 |
Balance, beginning of period |  | $ | 136 |  |  | $ | 227 |
Bad debt expense (credit) |  |  | 103 |  |  |  | (13 | )
Charge-offs and other |  |  | (60 | ) |  |  | (76 | )
Balance, end of period |  | $ | 179 |  |  | $ | 138 |

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