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Note 5 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares	Mar. 31, 2024	Dec. 31, 2023	Apr. 16, 2019
Options, Outstanding, Number (in shares)	749,239	807,685
Total (in shares)	6,623,968
Restricted Stock Units (RSUs) [Member]
Equity Instruments Other than Options, Nonvested, Number (in shares)	358,002	333,716
Performance Shares [Member]
Equity Instruments Other than Options, Nonvested, Number (in shares)	461,037	423,621
Equity Incentive Plan 2019 [Member]
Options, Outstanding, Number (in shares)	749,239
Number of Shares Authorized (in shares)	3,694,726		2,400,000
Equity Incentive Plan 2019 [Member] | Restricted Stock Units (RSUs) [Member]
Equity Instruments Other than Options, Nonvested, Number (in shares)	358,002
Equity Incentive Plan 2019 [Member] | Performance Shares [Member]
Equity Instruments Other than Options, Nonvested, Number (in shares)	461,037
Employee Stock Purchase Plan 2019 [Member]
Number of Shares Authorized (in shares)	1,360,964

X

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Aggregate number of common shares reserved for future issuance.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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