Note 6 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

	T hree Months Ended March 31, 2018
	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding at beginning of period		3,687,679		$	1.50
Granted		470,000			0.53
Exercised		—			—
Canceled and Forfeited		(5,000	)		0.51
Expired		—			—
Outstanding at end of period		4,152,679		$	1.39	6.8	$	—
Exercisable at end of period		2,159,746		$	2.06	4.5	$	—

	Three Months Ended March 31, 2018
	Number of Shares			Weighted Average Grant-Date Fair Value
Unvested at beginning of period		150,000		$	0.51
Granted		200,000			0.37
Vested		(100,000	)		0.43
Forfeited		—			—
Unvested at end of period		250,000		$	0.42