Note 6 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares	Jun. 30, 2026	Dec. 31, 2025
Options issued and outstanding (in shares)	426,409	487,427
Total shares of common stock reserved for future issuance (in shares)	6,016,873	2,225,262
April Convertible Note [Member]
Total shares of common stock reserved for future issuance (in shares)	1,250,839	0
June Convertible Note [Member]
Total shares of common stock reserved for future issuance (in shares)	1,577,244	0
The 2015 Equity Incentive Plan [Member]
Options issued and outstanding (in shares)	206,192	267,085
The 2021 Equity Incentive Plan [Member]
Options issued and outstanding (in shares)	220,217	220,342
Shares available for future grants (in shares)	71,376	795,645
The 2021 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Restricted stock units outstanding (in shares)	2,316,365	491,544
The 2021 Equity Incentive Plan [Member] \| Performance Shares [Member]
Restricted stock units outstanding (in shares)	15,000	83,780
The 2021 Employee Stock Purchase Plan [Member]
Shares available for future grants (in shares)	359,640	366,866

Aggregate number of common shares reserved for future issuance.

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