Note 4 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2023		2022		2023		2022
Stock-based compensation related to:
Stock option grants	$	14	$	42	$	34	$	95
Stock unit awards		129		196		286		322
Total stock-based compensation	$	143	$	238	$	320	$	417

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		( 66	)	$	14.70
Outstanding, June 30, 2023		442		$	14.09		4.6	$	14
Exercisable, June 30, 2023		431		$	14.40		4.5	$	7

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		(62	)	$	6.54
Cancelled		(11	)	$	6.54
Forfeited		(9	)	$	5.90
Outstanding & Unvested, June 30, 2023		156		$	6.05