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Stock Options and Warrants (Summary of Warrants Outstanding by Price Range) (Details) - Warrant [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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
Warrants outstanding exercise price range, upper limit   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
Warrants expired exercise price range, upper limit   0.07
Weighted average remaining contractual life 1 year 9 months 29 days  
Number exercisable 691,365  
Weighted average exercise price, exercisable $ 0.02 $ 0.02
Warrants exercisable, weighted average remaining contractual life 1 year 9 months 29 days