Note 3 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

				Weighted
				Average
				Exercise Price
	Options			Per Option
Options outstanding, December 31, 2019		1,326,414		$	2.86
Granted to employees and non-employee directors		-			0.00
Exercised		(712,839	)		2.58
Canceled/expired/forfeited		-			0.00
Options outstanding, March 31, 2020		613,575			3.43
Options exercisable, March 31, 2020		182,002			3.24