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Stock Options and Warrants (Summary of Options Outstanding by Price Range) (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding | shares 3,135,000
Remaining Average Contractual Life 3 years 15 days
Weighted Average Exercise Price, Outstanding $ 0.20
Number Exercisable | shares 2,864,160
Weighted Average Exercise Price, Exercisable $ 0.20
Range of Exercise Price [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, lower limit 0.04
Range of Exercise Price, upper limit $ 0.40
Number Outstanding | shares 3,135,000
Remaining Average Contractual Life 3 years 15 days
Weighted Average Exercise Price, Outstanding $ 0.20
Number Exercisable | shares 2,864,160
Weighted Average Exercise Price, Exercisable $ 0.20