Note 3 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 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		-			-
Exercised		(747,674	)		2.63
Canceled/expired/forfeited		-			-
Options outstanding, September 30, 2020		578,740			3.43
Options exercisable, September 30, 2020		172,167			3.22