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Note 11 - Revenues (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Instruments, equipment, software and accessories |  | $ | 28,485 |  |  | $ | 21,851 |  |  | $ | 82,304 |  |  | $ | 66,857 |
Service, maintenance and warranty contracts |  |  | 1,178 |  |  |  | 2,186 |  |  |  | 3,545 |  |  |  | 4,259 |
Total revenues |  | $ | 29,663 |  |  | $ | 24,037 |  |  | $ | 85,849 |  |  | $ | 71,116 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
United States |  | $ | 12,709 |  |  | $ | 11,110 |  |  | $ | 37,300 |  |  | $ | 30,381 |
Europe |  |  | 8,366 |  |  |  | 6,777 |  |  |  | 25,569 |  |  |  | 20,617 |
Asia |  |  | 7,161 |  |  |  | 4,240 |  |  |  | 18,588 |  |  |  | 14,180 |
Rest of the world |  |  | 1,427 |  |  |  | 1,910 |  |  |  | 4,392 |  |  |  | 5,938 |
Total revenues |  | $ | 29,663 |  |  | $ | 24,037 |  |  | $ | 85,849 |  |  | $ | 71,116 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | September 30, |  |  | December 31, |
(in thousands) |  | 2021 |  |  | 2020 |
Service contracts |  | $ | 1,839 |  |  | $ | 1,629 |
Customer advances |  |  | 1,784 |  |  |  | 2,142 |
Total deferred revenue |  | $ | 3,623 |  |  | $ | 3,771 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |
Balance, beginning of period |  | $ | 227 |  |  | $ | 325 |
Bad debt (credit) expense |  |  | (13 | ) |  |  | 24 |
Charge-offs and other |  |  | (71 | ) |  |  | (60 | )
Effect of foreign currency translation |  |  | (5 | ) |  |  | 4 |
Balance, end of period |  | $ | 138 |  |  | $ | 293 |

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