Note 3 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2022		2021		2022		2021
Stock-based compensation related to:
Stock option grants	$	42	$	77	$	95	$	221
Stock unit awards		196		92		322		165
Total stock-based compensation	$	238	$	169	$	417	$	386

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, 2021		574		$	14.23		6.1	$	100
Granted		-		$	-
Exercised		( 1	)	$	4.07
Forfeited		( 1	)	$	4.07
Outstanding, June 30, 2022		572		$	14.23		5.6	$	70
Exercisable, June 30, 2022		519		$	14.89		5.4	$	25

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		224		$	5.48
Granted		128		$	6.52
Converted to common stock		(36	)	$	6.45
Cancelled		(6	)	$	6.43
Forfeited		(36	)	$	5.66
Outstanding & Unvested, June 30, 2022		274		$	5.76