Note 6 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

	Six Months Ended June 30, 2018
	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in 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		(7,000	)		0.66
Outstanding at end of period		4,145,679		$	1.39		6.6	$	—
Exercisable at end of period		2,321,683		$	1.97		4.6	$	—

	Six Months Ended June 30, 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		(200,000	)		0.47
Forfeited		—			—
Unvested at end of period		150,000		$	0.37