Note 6 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

	Year Ended December 31, 201 8
	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding at beginning of year		3,687,679		$	1.50
Granted		470,000			0.53
Exercised		—			—
Canceled and forfeited		(992,510	)		1.86
Expired		(7,000	)		0.66
Outstanding at end of year		3,158,169		$	1.24		6.6	$	—
Exercisable at end of year		1,502,173		$	1.87		4.4	$	—

	Year Ended December 31, 201 8
	Number of Shares			Weighted Average Grant-Date Fair Value
Unvested at beginning of year		150,000		$	0.51
Granted		200,000			0.37
Forfeited		(50,000	)		0.36
Vested		(200,000	)		0.47
Unvested at end of year		100,000		$	0.37