Note 10 - Leases and Commitments	12 Months Ended
Dec. 31, 2023
Notes to Financial Statements
Leases And Commitments Disclosure [Text Block]	10. Leases and Commitments Right-of-use Asset and Liability The Company had an operating lease for approximately 6,000 square feet of office space in Austin, Texas expiring April 30, 2024. The Company terminated this lease on February 22, 2023 with no continuing obligations. Cash paid for operating lease liabilities totaled $24,000, $155,000 and $109,000 during the years ended December 31, 2023, 2022 and 2021, respectively. Other Commitments The Company conducts its product research and development programs through a combination of internal and collaborative programs that include, among others, arrangements with universities, contract research organizations and clinical research sites. It has contractual arrangements with these organizations that are generally cancelable. The Company’s obligations under these contracts are largely based on services performed. The Company is dependent on contract development and manufacturing organizations for the manufacture of all our materials for clinical studies.

Note 10 - Leases and Commitments

12 Months Ended

Dec. 31, 2023

Leases And Commitments Disclosure [Text Block]

10. Leases and Commitments

Right-of-use Asset and Liability

The Company had an operating lease for approximately 6,000 square feet of office space in Austin, Texas expiring April 30, 2024. The Company terminated this lease on February 22, 2023 with no continuing obligations.

Cash paid for operating lease liabilities totaled $24,000, $155,000 and $109,000 during the years ended December 31, 2023, 2022 and 2021, respectively.

Other Commitments

The Company conducts its product research and development programs through a combination of internal and collaborative programs that include, among others, arrangements with universities, contract research organizations and clinical research sites. It has contractual arrangements with these organizations that are generally cancelable. The Company’s obligations under these contracts are largely based on services performed.

The Company is dependent on contract development and manufacturing organizations for the manufacture of all our materials for clinical studies.