Note 5 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

	Year Ended December 31, 2016
	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding at beginning of year		5,437,064		$	1.96
Granted		479,457			1.05
Exercised		(50,000	)		0.27
Canceled and forfeited		(2,186,906	)		1.69
Expired		(299,000	)		2.42
Outstanding at end of year		3,380,615		$	2.00		6.5	$	16,013
Exercisable at end of year		2,548,681		$	2.07		6.1	$	16,013

	Year Ended December 31, 2016
	Number of Shares			Weighted Average Grant-Date Fair Value
Unvested at beginning of year		361,000		$	1.69
Granted		168,000			1.20
Forfeited		(206,000	)		1.77
Expired		(50,000	)		1.93
Vested		(66,000	)		1.65
Unvested at end of year		207,000		$	1.17