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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

In calculating the fair value of the warrants using the Black-Scholes model, the following assumptions were utilized:

Expected life (in years)	2
Volatility	68	%
Risk-free interest rate	1.23	%
Expected dividend rate	-

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

A summary of the status of the Company’s non-vested stock options at December 31 and changes during the year is as follows:

	2017				2016
	Number of Options		Weighted Average Grant Date Fair Value		Number of Options		Weighted Average Grant Date Fair Value

Non-vested stock options at January 1		335,283	$	5.09		466,009	$	5.79
Granted		127,000	$	3.69		171,900	$	4.22
Vested		(207,457)	$	5.16		(290,141)	$	5.67
Exercised		-		-		-		-
Forfeited/Expired/Exchanged		(15,955)	$	5.15		(12,485)	$	6.17
Non-vested stock options at December 31		238,871	$	4.27		335,283	$	5.09

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

The following weighted-average assumptions were utilized in the calculation of the fair value of the stock options:

Expected life	6.25 years
Weighted average volatility	69	%
Forfeiture rate	14	%
Weighted average risk-free interest rate	1.94	%
Expected dividend rate	0	%

Schedule Of Employee Service Share Based Compensation Unrecognized Period Costs [Table Text Block]

At December 31, 2017, there was $436,000 of total unrecognized compensation cost related to non-vested stock option-based compensation arrangements granted under the Plan. That cost is expected to be recognized in future years as follows:

2018	$	211,000
2019		144,000
2020		69,000
2021		12,000
	$	436,000

Schedule Of Recognized Compensation Cost [Table Text Block]

The recognized compensation cost associated with the Plan is as follows:

	2017		2016
Research and development	$	119,000	$	112,000
General and administrative		250,000		513,000
Effect on net loss	$	369,000	$	625,000
Effect on net loss per share	$	0.02	$	0.05

Schedule Of Share Based Compensation Warrants Activity [Table Text Block]

The following table summarizes the number of warrants, the weighted average exercise price, and weighted average life (in years) by price for both total outstanding warrants and total exercisable warrants at December 31, 2017:

	Total Outstanding Warrants
Exercise Price	Warrants		Wtd. Avg. Exercise Price		Remaining Life (in years)
$1.80		80,000	$	1.80		3.13
$4.00		2,395,471	$	4.00		1.07
$10.00		20,313	$	10.00		1.18
		2,495,784	$	3.98

Equity Incentive Plan [Member]

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

Activity under the Plan is as follows:

	2017		2016
Reserved but unissued shares under the Plan, beginning of year		266,884		455,372
Increases in the number of authorized shares under the Plan		255,261		15,039
Grants of stock options		(127,000)		(171,900)
Stock option forfeitures		15,955		12,485
Exercise of stock options		-		-
Stock grants		(219,444)		(44,112)
Reserved but unissued shares under the Plan, end of year		191,656		266,884

Consultant Plan [Member]

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

Activity under the Consultant Plan is as follows:

	2017		2016
Reserved but unissued shares under the Consultant Plan at January 1		83,633		92,130
Increases in the number of authorized shares under the Consultant Plan		25,526		1,503
Stock grants		(10,000)		(10,000)
Reserved but unissued shares under the Consultant Plan at Period End		99,159		83,633

Warrant [Member]

Schedule Of Share Based Compensation Warrants Activity [Table Text Block]

A summary of the Company’s warrant activity and related information is as follows:

	2017				2016
	Warrants		Average Exercise Price		Warrants		Average Exercise Price
Outstanding at January 1		445,313	$	4.65		564,272	$	4.14
Granted		2,395,471	$	4.00		-		-
Exercised		-		-		(118,959)	$	2.20
Forfeited/Expired		(345,000)	$	5.00		-		-
Outstanding at Period End		2,495,784	$	3.98		445,313	$	4.65

Employee Stock Option [Member]

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

A summary of the Company’s stock option activity and related information is as follows:

	2017						2016
	Options to Purchase Common Stock		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Options to Purchase Common Stock		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)
Outstanding at January 1		882,815	$	4.98		7.51		723,400	$	5.18		8.10
Granted		127,000	$	3.69		9.48		171,900	$	4.22		9.26
Exercised		-		-		-		-		-		-
Forfeited/Expired/Exchanged		(15,955)	$	5.15		-		(12,485)	$	6.17		-
Outstanding at December 31		993,860	$	4.81		6.94		882,815	$	4.98		7.51
Exercisable at December 31		754,989	$	4.98		6.32		547,532	$	4.91		6.85