Schedule of Changes in Common Stock Options (Details)	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding at the beginning of the period | shares	4,303,900
Options, Granted | shares	405,350
Options, Expired | shares	(745,000)
Options, Forfeited | shares	(18,900)
Options, Outstanding at the end of the period | shares	3,945,350
Options, Exercisable at the end of the period | shares	1,983,375
Weighted Average Exercise Price, Outstanding at the beginning of the period | $ / shares	$ 0.75
Weighted Average Exercise Price, Granted | $ / shares	0.67
Weighted Average Exercise Price, Expired | $ / shares	2.00
Weighted Average Exercise Price, Forfeited | $ / shares	0.45
Weighted Average Exercise Price, Outstanding at the end of the period | $ / shares	0.51
Weighted Average Exercise Price, Exercisable at the end of the period | $ / shares	$ 0.49