Note 5 - Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

						*Weighted-*				*Weighted-*				*Aggregate*
						*average*				*average*				*intrinsic*
						*exercise*				*contractual*				*value*
		*Amount*				*price*				*life (years)*				*(in thousands)*
Outstanding at December 31, 2025			4,641,685			$	3.72				6.2			$	200
Outstanding at March 31, 2026			4,641,685				3.72				6.0				108
Options exercisable			3,633,843				3.63				5.9				105
Options vested and expected to vest			4,620,139				3.71				6.0				108

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

		*Three Months Ended*
		*March 31,*
		*2026*				*2025*
		(In thousands)
Research and development		$	169			$	59
General and administrative			463				426
Total		$	632			$	485