Note 5 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 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		1.7	$	3.75	$	327,870
	$7.80			8,000		2.9	$	7.80	$	169,360
	$19.99			30,000		3.6	$	19.99	$	269,400
	$39.11			8,000		3.9	$	39.11	$	--
$3.50	-	$39.11		59,000		3.1	$	17.35	$	766,630

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		(2,925	)		12.82
Balance as of June 30, 2025		477,073		$	12.58

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2025		2024		2025		2024
General and administrative expense	$	187	$	170	$	225	$	330
Development expense		435		255		870		255
Total	$	622	$	425	$	1,095	$	585