Note 5 - Stock Based Compensation

9 Months Ended

Sep. 30, 2025

Notes to Financial Statements

Share-Based Payment Arrangement [Text Block]

5. Stock-Based Compensation

As of September 30, 2025, there were 4,677,666 shares remaining to be issued under the Company's equity compensation plans. 

Stock-based compensation expense for the three and nine months ended September 30, 2025 and 2024, respectively, is as follows (table in thousands): 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2025		2024		2025		2024
General and administrative	$	203	$	259	$	866	$	980
Research and development		100		94		339		319
Total stock-based compensation expense	$	303	$	353	$	1,205	$	1,299

The Company recorded stock compensation expense for the equity classified warrants relating to non-employee consulting agreements of $30,000 and $26,000 for the three months ended  September 30, 2025 and 2024, respectively, and $88,000 and $94,000 for the nine months ended September 30, 2025 and 2024, respectively, which are included in the table above. At  September 30, 2025, there was $440,000 of unrecognized stock compensation expense related to the Company's equity classified warrants. In September 2025, the Company issued 1,441,500 stock options to employees and contractors at $0.43 per shares which have a ten-year term and vest over 4 years.