10. Stock Options and Warrants (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Fair values of option awards granted

	2018	2017
Risk-free interest rate	2.65% - 2.92%	1.87% - 2.06%
Dividend yield	0%	0%
Expected term	5 years	5 years
Expected volatility	49.0% - 55.1%	44.6% - 47.0%

Options issued under foregoing option plans

	Options outstanding
				Weighted average	Weighted average		Aggregate
				exercise price	remaining		intrinsic
Incentive options	Shares			per share	contractual term		value
Outstanding at December 31, 2017	1,288,000		$	0.18
Options granted	166,000			0.44
Options exercised	-			-
Options expired	(62,500	)		0.31
Options forfeited	(15,000	)		0.46
Outstanding at December 31, 2018	1,376,500		$	0.23	4 years, 10 months	$	1,145
Exercisable at December 31, 2018	1,228,000		$	0.21	4 years, 3 months	$	1,145

Nonvested stock awards

	Nonvested
				Weighted average
				grant date
	Shares			fair value
Nonvested at January 1, 2018		232,000		$	0.10
Granted		166,000			0.20
Vested		(234,500	)		0.10
Forfeited		(15,000	)		0.21
Nonvested at December 31, 2018		148,500		$	0.20