Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing formula that uses assumptions noted in the following table. Expected volatilities and risk-free interest rates are based upon the expected life of the grant. The interest rates used are the U.S. Treasury yield curve in effect at the time of the grant.

	For the three months ended
	March 31, 2016		March 31, 2015
Expected volatility	68.0% - 69.9	%	52.7% - 55.2	%
Expected term (in years)	3.2 -3.3 years		3.2 -3.3 years
Risk-free rate	1.15	%	0.89% - 1.14	%
Expected dividends	0	%	0	%

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

A summary of option activity under the 1999 Plan, the Director Plan and the 2009 Plan as of March 31, 2016 and changes during the period are presented below:

			Weighted
	Number of		Average
	Options		Exercise Price
Outstanding as of January 1, 2016		3,592,734	$	4.36
Issued		485,135	$	7.46
Exercised		(1,000)	$	1.10
Forfeited		(31,000)	$	8.64
Expired		-		-
Outstanding as of March 31, 2016		4,045,869	$	4.70
Exercisable as of March 31, 2016		2,533,202	$	2.57

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table summarizes information regarding options outstanding and exercisable at March 31, 2016:

Outstanding:
					Weighted
	Stock		Weighted		Average
	Options		Average		Remaining
Range of  Exercise Prices	Outstanding		Exercise Price		Contractual Life
$0.79 - $1.00		50,000	$	0.79		3.76
$1.01 - $1.50		1,861,400	$	1.07		5.89
$1.51 - $10.67		2,134,469	$	7.95		8.97
Total		4,045,869	$	4.70		7.49

Exercisable:
	Stock		Weighted
	Options		Average
Range of  Exercise Prices	Exercisable		Exercise Price
$0.79 - $1.00		50,000	$	0.79
$1.01 - $1.50		1,851,400	$	1.07
$1.51 - $10.67		631,802	$	7.12
Total		2,533,202	$	2.57

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Number of		Weighted Average
	RSUs		Exercise Price
Non-vested balance at January 1, 2016		182,750	$	10.23
Changes during the period:
Shares granted		58,068		7.50
Shares vested		(52,584)		10.67
Shares forfeited		-		-
Non-vested balance at March 31, 2016		188,234	$	9.26