Stock Options and Warrants (Summary of Warrants Outstanding by Price Range) (Details) - Warrant [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Shares Authorized Under Equity Instruments Other Than Options Exercise Price Range [Line Items]
Warrants outstanding exercise price range, lower limit	$ 0.01	$ 0.01
Warrants outstanding exercise price range, upper limit	0.07	0.07
Warrants exercised exercise price range, lower limit	0.01
Warrants exercised exercise price range,upper limit	0.03
Warrants expired exercise price range, lower limit	0.06	0.045
Warrants expired exercise price range, upper limit	$ 0.07	0.06
Warrants exercisable exercise price range, lower limit		0.01
Warrants exercisable exercise price range, upper limit		$ 0.07
Weighted average remaining contractual life	2 years 9 months 29 days
Number exercisable	691,365	721,365
Weighted average exercise price, exercisable	$ 0.02	$ 0.021
Warrants exercisable, weighted average remaining contractual life	2 years 9 months 29 days