Note 6 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

	Three-month period ended				Six-month period ended
	June 30,		June 30,		June 30,		June 30,
	2022		2021		2022		2021
Stock options	$	181	$	174	$	362	$	337
Restricted stock grants		3		12		11		33
Total	$	184	$	186	$	373	$	370

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

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2022		1,306,824		$	6.87
Granted		5,000			4.68
Exercised		(58,750	)		3.81
Forfeited or expired		(44,834	)		6.76
Outstanding at June 30, 2022		1,208,240		$	7.01		4.07	$	33
Vested and expected to vest at June 30, 2022		1,103,948		$	7.01		3.93	$	33
Exercisable at June 30, 2022		717,956		$	7.06		2.93	$	33