Stock Options (Summary of Stock Options Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Options
Outstanding, beginning of year	3,858,000	3,560,065
Granted	30,000	787,500
Exercised
Cancelled
Expired	(522,500)	(489,565)
Outstanding, end of year	3,365,500	3,858,000
Exercisable, end of year	2,804,660	2,851,333
Options available for future grant, end of year	1,303,336	537,008
Weighted Average Exercise Price
Outstanding, beginning of year	$ 0.22	$ 0.24
Granted	0.05	0.16
Exercised
Cancelled
Expired	0.30	0.34
Outstanding, end of year	0.20	0.22
Exercisable, end of year	$ 0.20	$ 0.23