Note 9 - Capital Stock	3 Months Ended
Mar. 31, 2024
Notes to Financial Statements
Disclosure of Employee Stock Ownership Plans [Text Block]	Note 9 — Capital Stock *Issuance of Common Stock* On March 13, 2024, the Company entered into common stock purchase agreements with certain institutional investors and their affiliated entities for the sale of an aggregate of 222,500 thousand shares of common stock, par value $0.001, in a registered direct offering, resulting in net cash proceeds of approximately $3.5 million. The purchase price for each share of common stock was $16.00. The per share purchase price reflects a zero discount based upon the 10-day volume weighted average price on the day the pricing was agreed. Issuance costs related to the offering were immaterial. On March 21, 2023, the Company entered into common stock purchase agreements with certain investors for the sale of an aggregate of 450 thousand shares of its common stock, in a registered direct offering pursuant to an effective shelf registration statement on Form S-3, resulting in net cash proceeds of approximately $2.3 million. Issuance costs related to the offering were immaterial. The purchase price for each share of common stock in the Share Placement was $5.14. On August 17, 2022, the Company filed a Registration Statement on Form S-3 (File No. 333-266942) with the SEC, under which it may sell, from time-to-time common stock, preferred stock, depositary shares, warrants, debt securities, and units, individually or as units comprised of one or more of the other securities or a combination thereof. The Company's registration statement became effective on August 26, 2022.

Note 9 - Capital Stock

3 Months Ended

Mar. 31, 2024

Disclosure of Employee Stock Ownership Plans [Text Block]

Note 9 — Capital Stock

Issuance of Common Stock

On March 13, 2024, the Company entered into common stock purchase agreements with certain institutional investors and their affiliated entities for the sale of an aggregate of 222,500 thousand shares of common stock, par value $0.001, in a registered direct offering, resulting in net cash proceeds of approximately $3.5 million. The purchase price for each share of common stock was $16.00. The per share purchase price reflects a zero discount based upon the 10-day volume weighted average price on the day the pricing was agreed. Issuance costs related to the offering were immaterial.

On March 21, 2023, the Company entered into common stock purchase agreements with certain investors for the sale of an aggregate of 450 thousand shares of its common stock, in a registered direct offering pursuant to an effective shelf registration statement on Form S-3, resulting in net cash proceeds of approximately $2.3 million. Issuance costs related to the offering were immaterial. The purchase price for each share of common stock in the Share Placement was $5.14.

On August 17, 2022, the Company filed a Registration Statement on Form S-3 (File No. 333-266942) with the SEC, under which it may sell, from time-to-time common stock, preferred stock, depositary shares, warrants, debt securities, and units, individually or as units comprised of one or more of the other securities or a combination thereof. The Company's registration statement became effective on August 26, 2022.