Note 5 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - Money Market Funds [Member] - USD ($) $ in Thousands |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Estimate of Fair Value Measurement [Member] | ||
| Cash equivalents | $ 42,495 | $ 46,061 |
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Cash equivalents | 42,495 | 46,061 |
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Cash equivalents | 0 | 0 |
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Cash equivalents | 0 | 0 |
| Reported Value Measurement [Member] | ||
| Cash equivalents | $ 42,495 | $ 46,061 |