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Note 5 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Capital Reserved for Future Issuance [Table Text Block] | Common stock reserved for future issuance consists of the following as of September 30, 2025:
Stock options outstanding under 2019 Equity Incentive Plan |  |  | 508,875 |
Restricted stock units outstanding under 2019 Equity Incentive Plan |  |  | 302,720 |
Performance stock units outstanding under 2019 Equity Incentive Plan, at target |  |  | 502,246 |
Shares authorized for future issuance under 2019 Equity Incentive Plan |  |  | 4,221,675 |
Shares authorized for future issuance under 2019 Employee Stock Purchase Plan |  |  | 1,581,244 |
Total |  |  | 7,116,760 |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] | The below table summarizes the Company’s stock-based compensation expense for each period presented:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (in thousands) |  |  | (in thousands) |
Stock-based compensation |  | $ | 5,379 |  |  | $ | 4,117 |  |  | $ | 15,471 |  |  | $ | 11,905 |
Share-Based Payment Arrangement, Activity [Table Text Block] | The following table summarizes stock option transactions for the nine months ended September 30, 2025:
|  | Number of shares |  |  | Weighted-average exercise price |  |  | Weighted-average remaining contractual term (in years) |  |  | Aggregate intrinsic value (in thousands) |
Outstanding at January 1, 2025 |  |  | 588,385 |  |  | $ | 33.76 |  |  |  | 4.9 |  |  | $ | 42,273 |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |
Options exercised |  |  | (78,976 | ) |  |  | 42.36 |  |  |  |  |  |  |
Options cancelled |  |  | (534 | ) |  |  | 83.46 |  |  |  |  |  |  |
Outstanding at September 30, 2025 |  |  | 508,875 |  |  | $ | 32.37 |  |  |  | 4.1 |  |  | $ | 53,284 |
Vested and Exercisable at September 30, 2025 |  |  | 508,807 |  |  | $ | 32.37 |  |  |  | 4.1 |  |  | $ | 53,279 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes RSU transactions for the nine months ended September 30, 2025:
|  | Number of shares |  |  | Weighted-average grant date fair value |
Outstanding at January 1, 2025 |  |  | 320,411 |  |  | $ | 65.03 |
Granted |  |  | 130,320 |  |  |  | 115.65 |
Released |  |  | (140,737 | ) |  |  | 62.68 |
Forfeited |  |  | (7,274 | ) |  |  | 85.58 |
Non-vested outstanding at September 30, 2025 |  |  | 302,720 |  |  | $ | 87.42 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] | The following table summarizes PSU transactions for the nine months ended September 30, 2025:
|  | Number of shares |  |  | Weighted-average grant date fair value |
Outstanding at January 1, 2025 |  |  | 460,450 |  |  | $ | 40.43 |
Granted |  |  | 86,844 |  |  |  | 99.61 |
Vested |  |  | (41,400 | ) |  |  | 50.35 |
Forfeited |  |  | (3,648 | ) |  |  | 73.15 |
Non-vested outstanding at September 30, 2025 |  |  | 502,246 |  |  | $ | 49.60 |

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