Warrants (Summary of Warrants Activity) (Details) - Warrant [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Warrant activity, number of shares:
Outstanding, at the beginning of year	1,099,915	1,068,280
Granted	350,000	264,585
Exercised
Expired	(134,575)	(232,950)
Outstanding, at the end of year	1,315,340	1,099,915
Warrant activity, weighted average exercise price:
Outstanding, at the beginning of year	$ 0.32	$ 0.37
Granted	0.05	0.25
Exercised
Expired	(0.39)	0.50
Outstanding, at the end of year	$ 0.24	$ 0.32