Stock Options (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Options Activity

Additional information concerning the activity in the three option plans is as follows:

	2017						2016
	Options			Weighted Average Exercise Price			Options			Weighted Average Exercise Price
Outstanding, beginning of year		3,365,500		$	0.20			3,858,000		$	0.22
Granted		5,000			0.03			30,000			0.05
Exercised		—			—			—			—
Forfeited		(36,667	)		(0.14			—			—
Expired		(153,833	)		(0.22	)		(522,500	)		(0.30	)
Outstanding, end of year		3,180,000		$	0.20			3,365,500		$	0.20
Exercisable, end of year		2,909,160		$	0.20			2,804,660		$	0.20
Options available for future grant, end of year		1,245,500						1,303,336

Schedule of Unvested Options Activity

Additional information concerning the unvested options is as follows:

	2017						2016
	Options			Weighted Average Exercise Price			Options			Weighted Average Exercise Price
Non-Vested options at beginning of year		560,840		$	0.17			1,006,667		$	0.17
Granted		5,000			0.03			30,000			0.05
Vested		(258,333	)		(0.16	)		(445,827	)		(0.17	)
Forfeited		(36,667	)		(0.14	)
Cancelled		—			—			(30,000	)		(0.17	)
Non-Vested options end of year		270,840		$	0.15			560,840		$	0.16

Summary of Options Outstanding by Price Range

Summarized information with respect to options outstanding under the three option plans at December 31, 2017 is as follows:

	Options Outstanding			Options Exercisable
Range of Exercise Price	Number Outstanding	Remaining Average Contractual Life (In Years)	Weighted Average Exercise Price	Number Exercisable	Weighted Average Exercise Price
$0.026 - $0.35	3,180,000	3.63	$0.20	2,909,160	$0.20

Schedule of Fair Value Assumptions

The estimated fair value of each stock option grant on the date of grant was computed using the following weighted-average assumptions:

	December 31,
	2017		2016
Risk-free interest rate	1.54	%	0.79%-1.45	%
Expected term (life) of options (in years)	5		4-10
Expected dividends	—		—
Expected volatility	210	%	172%-206.	%