Note 6 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Three-month period ended
	March 31,		March 31,
	2022		2021
Stock options	$	181	$	163
Restricted stock grants		8		21
Total	$	189	$	184

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		-			-
Exercised		(58,750	)		3.81
Forfeited or expired		(43,584	)		6.75
Outstanding at March 31, 2022		1,204,490		$	7.02		4.31	$	154
Vested and expected to vest at March 31, 2022		1,086,934		$	7.03		4.16	$	152
Exercisable at March 31, 2022		644,453		$	7.13		2.96	$	145