Employee Stock Options (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2019

Dec. 31, 2018

Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]

Schedule of assumptions used to estimate fair value stock options granted

	March 31, 2019
Expected dividend yield		0	%
Expected volatility		90	%
Risk-free interest rate		2.40	%
Expected life of options		4.00 years

Employee Stock Option [Member]

Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]

Schedule of assumptions used to estimate fair value stock options granted

	2019
Expected dividend yield		0	%
Expected volatility		90	%
Risk-free interest rate		2.40-2.47	%
Expected life of options		4.0 years

	2018
Expected dividend yield		0	%
Expected volatility		83-86	%
Risk-free interest rate		2.49	%
Expected life of options		2.50-3.00 years

	2018			2017
Expected dividend yield		0	%		0	%
Expected volatility		80-96	%		82-101	%
Risk-free interest rate		2.41-2.93	%		1.50-2.62	%
Expected life of options		4.0 years			2.5-4.0 years

Schedule of stock option activity

	Number of Options			Weighted Average Exercise Price per Share		Weighted Average Contractual Life in Years		Aggregate Intrinsic Value
Outstanding – December 31, 2018		13,990,000		$	0.61		3.15
Exercisable – December 31, 2018		13,610,000		$	0.59		3.16	$	0
Granted		130,000		$	1.06
Cancelled or Expired		(50,000	)	$	0.90
Outstanding – March 31, 2019		14,070,000		$	0.61		2.92
Exercisable – March 31, 2019		13,700,000		$	0.60		2.91	$	6,340,000

	Number of Options		Weighted Average Exercise Price per Share		Weighted Average Contractual Life in Years		Aggregate Intrinsic Value
Outstanding – December 31, 2017		7,945,000	$	1.38		3.50
Exercisable – December 31, 2017		7,627,500	$	1.35		3.50	$	0
Granted		100,000	$	1.00
Cancelled or Expired		-	$	.00
Outstanding – March 31, 2018		8,045,000	$	1.37		3.27	$	0
Exercisable – March 31, 2018		7,677,500	$	1.36		3.25	$	0

	Number of Options			Weighted Average Exercise Price per Share		Weighted Average Contractual Life in Years		Aggregate Intrinsic Value
Outstanding – December 31, 2016		442,500		$	5.81		1.72
Exercisable – December 31, 2016		407,500		$	5.57		1.65	$	0
Granted		7,510,000		$	1.12
Cancelled or Expired		(7,500	)	$	4.18
Outstanding – December 31, 2017		7,945,000		$	1.38		3.50
Exercisable – December 31, 2017		7,627,500		$	1.35		3.50	$	0
Granted		11,560,000		$	0.82
Cancelled or Expired		(5,515,000	)	$	1.37
Outstanding – December 31, 2018		13,990,000		$	0.61		3.15	$
Exercisable – December 31, 2018		13,610,000		$	0.59		3.16	$	0