Stock Options and Warrants (Tables)

6 Months Ended

Jun. 30, 2017

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 six months ended June 30, 2017 and June 30, 2016:

	Six 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%

Warrant [Member]

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

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

	Six months ended June 30, 2017					Six months ended June 30, 2016
					Aggregate
					Intrinsic Value as of June 30,					Aggregate Intrinsic Value as of
	Shares		Weighted Average Exercise Price		2017	Shares		Weighted Average Exercise Price		June 30, 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			0		NA
Warrants outstanding at end of period		2,060,000	$	0.18	None		2,385,000	$	0.17	$	0
Warrants exercisable at end of period		2,060,000	$	0.18			2,385,000	$	0.17

Employee Stock Option [Member]

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

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

	Six months ended June 30, 2017						Six months ended June 30, 2016
					Aggregate						Aggregate Intrinsic Value as of
					Intrinsic Value as of June 30,				Weighted Average Exercise		June 30,
	Shares		Weighted Average Exercise Price		2017		Shares		Price		2016
Options outstanding at beginning of period		2,107,000	$	0.13				1,435,000	$	0.14
Granted		40,000	$	0.13				830,000	$	0.11
Exercised		0		NA				0		NA
Cancelled/expired		0		NA				(78,000)	$	0.18
Options outstanding at end of period		2,147,000	$	0.13	$	15,000		2,187,000	$	0.13	$	16,000
Options exercisable at end of period		1,647,000	$	0.13				1,189,000	$	0.14