Note 3 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

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

	Three Months Ended
	March 31,
	2023		2022
Stock-based compensation related to:
Stock option grants	$	20	$	53
Stock unit awards		157		126
Total stock-based compensation	$	177	$	179

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

						Weighted Average
				Weighted Average		Remaining		Aggregate
	Number of			Exercise Price		Contractual Life		Intrinsic
	Shares			Per Share		(years)		Value(1)
Outstanding, December 31, 2022		508		$	14.19		5.1	$	25
Canceled		( 64	)	$	14.70
Outstanding, March 31, 2023		444		$	14.09		4.8	$	33
Exercisable, March 31, 2023		402		$	14.67		4.6	$	17

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

	Number of Shares			Weighted Average Grant-Date Fair Value Per Share
Outstanding & Unvested, December 31, 2022		238		$	6.10
Converted to common stock		(5	)	$	6.36
Cancelled		(2	)	$	6.19
Forfeited		(9	)	$	5.90
Outstanding & Unvested, March 31, 2023		222		$	6.10