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Note 5 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 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 June 30, 2025:
Stock options outstanding under 2019 Equity Incentive Plan |  |  | 510,444 |
Restricted stock units outstanding under 2019 Equity Incentive Plan |  |  | 314,227 |
Performance stock units outstanding under 2019 Equity Incentive Plan, at target |  |  | 503,451 |
Shares authorized for future issuance under 2019 Equity Incentive Plan |  |  | 4,225,816 |
Shares authorized for future issuance under 2019 Employee Stock Purchase Plan |  |  | 1,587,360 |
Total |  |  | 7,141,298 |
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 June 30, |  |  | Six Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (in thousands) |  |  | (in thousands) |
Stock-Based Compensation |  | $ | 5,347 |  |  | $ | 3,968 |  |  | $ | 10,092 |  |  | $ | 7,789 |
Share-Based Payment Arrangement, Activity [Table Text Block] | The following table summarizes stock option transactions for the six months ended June 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 |  |  | (77,599 | ) |  |  | 42.09 |  |  |  |  |  |  |
Options cancelled |  |  | (342 | ) |  |  | 94.38 |  |  |  |  |  |  |
Outstanding at June 30, 2025 |  |  | 510,444 |  |  | $ | 32.45 |  |  |  | 4.4 |  |  | $ | 53,407 |
Vested and Exercisable at June 30, 2025 |  |  | 510,024 |  |  | $ | 32.41 |  |  |  | 4.4 |  |  | $ | 53,382 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes RSU transactions for the six months ended June 30, 2025:
|  | Number of shares |  |  | Weighted-average grant date fair value |
Outstanding at January 1, 2025 |  |  | 320,411 |  |  | $ | 65.03 |
Granted |  |  | 120,775 |  |  |  | 115.43 |
Released |  |  | (122,487 | ) |  |  | 60.64 |
Forfeited |  |  | (4,472 | ) |  |  | 82.82 |
Non-vested outstanding at June 30, 2025 |  |  | 314,227 |  |  | $ | 85.87 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] | The following table summarizes PSU transactions for the six months ended June 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 |  |  | (2,443 | ) |  |  | 64.97 |
Non-vested outstanding at June 30, 2025 |  |  | 503,451 |  |  | $ | 49.70 |

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