Note 8 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2026

Notes Tables

Schedule of Share-based Compensation, Expense [Table Text Block]

		Three months ended								Six months ended
		June 30,								June 30,
		2026				2025				2026				2025
Research and development		$	63			$	55			$	118			$	150
Selling, general and administrative			46				43				104				118
Total share-based compensation		$	109			$	98			$	222			$	268

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

		Number of shares				Weighted average exercise price				Weighted average remaining contractual term (years)				Aggregate intrinsic value (in thousands)

Outstanding, December 31, 2025			485,203			$	17.19				8.4			$	—
Stock options granted			30,000				1.29
Stock options forfeited			(12,271	)			11.24
Outstanding, June 30, 2026			502,932			$	16.38				8.1			$	—
Exercisable, June 30, 2026			170,648			$	44.70				5.5			$	—

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

						Weighted
						average
						grant date
		Number of				fair value
		shares				per share
Balance, December 31, 2025			—			$	n/a
RSUs granted			296,041				1.24
RSUs released			(8,621	)			1.20
Balance, June 30, 2026			287,420			$	1.24