Note 3 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

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

				Weighted
				Average
				Exercise Price
	Options			Per Option
Options outstanding, December 31, 2018		1,022,913		$	2.69
Granted to employees and non-employee directors		310,000			3.62
Exercised		(33,334	)		1.80
Canceled/expired/forfeited		-			0.00
Options outstanding, March 31, 2019		1,299,579			2.93
Options exercisable, March 31, 2019		461,751			2.50