Stock Options and Warrants (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Warrant activity for the nine months ended September 30, 2017 and September 30, 2016 is summarized as follows:

	Nine months ended September 30, 2017						Nine months ended September 30, 2016
					Aggregate						Aggregate
			Weighted		Intrinsic Value				Weighted		Intrinsic Value
			Average		as of				Average		as of
			Exercise		September 30,				Exercise		September 30,
	Shares		Price		2017		Shares		Price		2016
Warrants outstanding at beginning of period		2,060,000	$	0.18				2,385,000	$	0.17
Granted		0		NA				0		NA
Exercised		0		NA				0		NA
Cancelled/expired		0		NA				(325,000)	$	0.14
Warrants outstanding at end of period		2,060,000	$	0.18	$	0		2,060,000	$	0.18	$	0
Warrants exercisable at end of period		2,060,000	$	0.18				2,060,000	$	0.18

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following table summarizes weighted-average assumptions using the Black-Scholes option-pricing model used on the date of the grants issued during the nine months ended September 30, 2017 and September 30, 2016:

	Nine months ended
	2017			2016
Volatility		81	%		62% - 66	%
Expected term (years)		10 years			10 years
Risk-free interest rate		2.16	%		1.57% - 1.94	%
Dividend yield		0	%		0	%

Employee Stock Option [Member]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Stock option activity for the nine months ended September 30, 2017 and September 30, 2016 is summarized as follows (the figures contained within the tables below have been rounded to the nearest thousand):

	Nine months ended September 30, 2017						Nine months ended September 30, 2016
					Aggregate						Aggregate
			Weighted		Intrinsic				Weighted		Intrinsic
			Average		Value as of				Average		Value as of
			Exercise		September 30,				Exercise		September 30,
	Shares		Price		2017		Shares		Price		2016
Options outstanding at beginning of period		2,107,000	$	0.13				1,435,000	$	0.13
Granted		40,000	$	0.13				830,000	$	0.11
Exercised		0		NA				0		NA
Cancelled/expired		0		NA				(83,000)	$	0.19
Options outstanding at end of period		2,147,000	$	0.13	$	15,000		2,182,000		0.13	$	30,000
Options exercisable at end of period		1,647,000	$	0.13				1,184,000	$	0.14