Note 10 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	Three Months Ended
	March 31,
	2024		2023
Cost of revenue	$	1	$	1
Engineering and product development		56		73
Marketing and sales		62		131
General and administrative		146		381
	$	265	$	586

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended
	March 31,
	2024			2023
Average risk-free interest rate		4.36	%		4.19	%
Expected dividend yield	None			None
Expected life (average, in years)		3.1			3.0
Expected volatility		83.35%-113.87%			72.69%-77.53%
Weighted average exercise price	$	1.52		$	2.16
Weighted average fair value	$	0.86		$	1.14

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

	Number of			Weighted Average		Intrinsic
	Options			Exercise Price		Value
Outstanding as of December 31, 2023		2,897,663		$	5.57	$	252
Granted		429,328		$	1.52
Exercised		—		$	—	$	—
Cancelled		(311,067	)	$	9.73
Outstanding as of March 31, 2024		3,015,924		$	4.56	$	206
Options Exercisable as of December 31, 2023		1,593,935		$	8.08	$	30
Options Exercisable as of March 31, 2024		1,516,875		$	7.18	$	26