Schedule of Changes in Common Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning of year	2,175,000	2,165,000
Options, Granted	3,259,200	50,000
Options, Exercised	(40,000)	0
Options, Expired	(20,000)	(40,000)
Options, Forfeited	(205,000)	0
Options outstanding, end of year	5,169,200	2,175,000
Options exercisable at year end	1,847,500	1,743,750
Weighted Average Exercise Price, Outstanding at beginning of year	$ 1.70	$ 1.71
Weighted Average Exercise Price, Granted	0.45	0.42
Weighted Average Exercise Price, Exercised	0.12
Weighted Average Exercise Price, Expired	0.15	0.90
Weighted Average Exercise Price, Forfeited	0.92
Weighted Average Exercise Price, Outstanding at end of year	0.96	1.70
Weighted Average Exercise Price, Options exercisable at end of year	1.86	1.78
Weighted-average fair value of options granted during the year	$ 0.31	$ 0.29