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Note 5 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares | Jun. 30, 2025 | Dec. 31, 2024 | Apr. 16, 2019
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Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Options, Outstanding, Number (in shares) | 510,444 | 588,385 |
Total (in shares) | 7,141,298 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number (in shares) | 314,227 | 320,411 |
Performance Shares [Member] |  |  |
Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number (in shares) | 503,451 | 460,450 |
Equity Incentive Plan 2019 [Member] |  |  |
Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Options, Outstanding, Number (in shares) | 510,444 |  |
Number of Shares Authorized (in shares) | 4,225,816 |  | 2,400,000
Equity Incentive Plan 2019 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number (in shares) | 314,227 |  |
Equity Incentive Plan 2019 [Member] | Performance Shares [Member] |  |  |
Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number (in shares) | 503,451 |  |
Employee Stock Purchase Plan 2019 [Member] |  |  |
Schedule Of Capital Reserved For Future Issuance [Line Items] |  |  |
Number of Shares Authorized (in shares) | 1,587,360 |  |

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