Stock Options (Schedule of Unvested Options Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Unvested stock option activity, shares:
Non-Vested options at beginning of year	560,840	1,006,667
Granted	5,000	30,000
Vested	(258,333)	(445,827)
Forfeited	(36,667)
Cancelled		(30,000)
Non-Vested options end of year	270,840	560,840
Unvested stock option activity, weighted average exercise price:
Non-Vested options at beginning of year	$ 0.16	$ 0.17
Granted	0.03	0.05
Vested	(0.16)	(0.17)
Forfeited	(0.14)
Cancelled		(0.17)
Non-Vested options end of year	$ 0.15	$ 0.16