Stock Options and Warrants (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016 and 2015:

	Six month ended
	June 30, 2016	June 30, 2015
Volatility	62% - 66%	63% - 64%
Expected term (years)	10 years	10 years
Risk-free interest rate	1.57% - 1.94%	1.92% – 2.33%
Dividend yield	0%	0%

Warrant [Member]

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

Warrant activity during the six months ended June 30, 2016 and the six months ended June 30, 2015 is summarized as follows:

	Six month ended June 30, 2016						Six months ended June 30, 2015
	Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of June 30, 2016		Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of June 30, 2015
Warrants outstanding at beginning of period		2,385,000	$	0.17				3,303,000	$	0.17
Granted		0		NA				0		NA
Exercised		0		NA				0		NA
Cancelled/expired		0		NA				0		NA
Warrants outstanding at end of period		2,385,000	$	0.17	$	0		3,303,000	$	0.17	$	0
Warrants exercisable at end of period		2,385,000	$	0.17				3,303,000	$	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, 2016 and the six months ended June 30, 2015 is summarized as follows (the figures contained within the tables below have been rounded to the nearest thousand):

	Six months ended June 30, 2016						Six months ended June 30, 2015
	Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of June 30, 2016		Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of June 30, 2015
Options outstanding at beginning of period		1,435,000	$	0.14				1,295,000	$	0.23
Granted		830,000	$	0.11				340,000	$	0.12
Exercised		0		NA				0		NA
Cancelled/expired		(78,000)	$	0.18				(88,000)	$	0.95
Options outstanding at end of period		2,187,000	$	0.13	$	16,000		1,547,000	$	0.19	$	9,000
Options exercisable at end of period		1,189,000	$	0.14				1,105,000	$	0.22