Note 3 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

				Weighted Average
				Exercise Price
	Options			Per Option
Options outstanding, December 31, 2020		568,740		$	3.42
Granted to employees and non-employee directors		-			-
Exercised		(89,494	)		3.45
Canceled/expired/forfeited		-			-
Options outstanding, March 31, 2021		479,246			3.42
Options exercisable, March 31, 2021		182,002			5.80