Note 5 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

Options Outstanding and Exercisable:
Range of Exercise Price			Number Outstanding		Wgt. Avg. Contractual Life Remaining (in years)		Wgt. Avg. Exercise Price		Aggregate Intrinsic Value
$3.50	-	$3.86		13,000		2.0	$	3.75	$	194,490
$7.80				8,000		3.2	$	7.80	$	87,280
$19.99				30,000		3.8	$	19.99	$	–
$39.11				8,000		4.2	$	39.11	$	–
$3.50	-	$39.11		59,000		3.4	$	17.35	$	281,770

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Number of Restricted Stock Units			Weighted-average grant date fair value per share
Balance as of December 31, 2024		479,998		$	12.59
Granted		–			–
Vested		–			–
Canceled and forfeited		(2,693	)		12.81
Balance as of March 31, 2025		477,305		$	12.58

Three months ended March 31, (in thousands)	2025		2024
General and administrative expense	$	38	$	160
Development expense		435		–
Total	$	473	$	160