Note 3 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Share-based Compensation, Stock Options, Activity [Table Text Block]

				Weighted
				Average
				Exercise Price
	Options			Per Option
Options outstanding, December 31, 2017		884,998		$	2.26
Granted to employees and non-employee directors		289,750			3.20
Exercised		(71,667	)		1.67
Canceled/expired/forfeited		-			0.00
Options outstanding, June 30, 2018		1,103,081			2.54
Options exercisable, June 30, 2018		465,003			2.09