Stock Options and Warrants (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015 and the six months ended June 30, 2014:

	Six months ended
	2015	2014
Volatility	63% - 64%	73%
Expected term (years)	10	10
Risk-free interest rate	1.92% - 2.33%	2.64%
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, 2015 and the six months ended June 30, 2014 is summarized as follows (the figures contained within the tables below have been rounded to the nearest thousand):

	Six months ended June 30, 2015						Six months ended June 30, 2014
	Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of March 31, 2015		Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of March 31, 2014
Warrants outstanding at beginning of period		3,303,000	$	0.17				3,224,000	$	0.17
Granted		0		NA				0		NA
Exercised		0		NA				0		NA
Cancelled/expired		0		NA				0		NA
Warrants outstanding at end of period		3,303,000	$	0.17	$	0		3,224,000	$	0.17	$	0
Warrants exercisable at end of period		3,303,000	$	0.17				3,224,000	$	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, 2015 and the six months ended June 30, 2014 is summarized as follows (the figures contained within the tables below have been rounded to the nearest thousand):

	Six months ended June 30, 2015						Six months ended June 30, 2014
	Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of June 30, 2015		Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value as of June 30, 2014
Options outstanding at beginning of period		1,295,000	$	0.23				3,316,000	$	0.43
Granted		340,000	$	0.12				80,000	$	0.12
Exercised		0		NA				0		NA
Cancelled/expired		(88,000)	$	0.95				(817,000)	$	1.07
Options outstanding at end of period		1,547,000	$	0.19	$	9,000		2,579,000	$	0.23	$	9,000
Options exercisable at end of period		1,105,000	$	0.22				2,197,000	$	0.24