Note 3 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 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		(737,674	)		2.61
Canceled/expired/forfeited		-			-
Options outstanding, June 30, 2020		588,740			3.33
Options exercisable, June 30, 2020		157,167			2.76