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Note 9 - Stock-Based Compensation (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2015

Dec. 31, 2014

Notes Tables

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

		Number of Shares				Weighted Average Exercise Price
Outstanding at December 31, 2014			1,183,100			$	3.50
Granted			26,400				0.15
Exercised			--				--
Forfeited or expired			(32,000	)			0.94
Outstanding at June 30, 2015			1,177,500			$	3.49
Exercisable at June 30, 2015			756,094			$	5.25

		Number of Shares				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (yrs)				Aggregate Intrinsic Value
Outstanding at December 31, 2013			1,197,044			$	3.79
Granted			217,500				0.17
Exercised			-				-
Forfeited or expired			(231,444	)			1.89
Outstanding at December 31, 2014			1,183,100			$	3.50				6.6			$	-0-
Exercisable at December 31, 2014			785,594			$	5.09				5.2			$	-0-

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

		2014				2013				2012
Weighted average fair value of options granted		$	0.14			$	0.43			$	0.59
Intrinsic value of options exercised			-0-				-0-				-0-
Total fair value of options vested			97,707				165,490				319,920

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

		2014				2013				2012
Weighted average risk-free interest rates			1.98	%			2.3	%			1.1	%
Expected dividend yield			0.0	%			0.0	%			0.0	%
Expected life of option (years)			7.0				7.0				6.7
Expected volatility			94.88	%			96.60	%			105.2	%

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		2014				2013				2012
General and administrative expense		$	69,057			$	101,896			$	231,936
Research and development expense			32,134				41,539				78,140
Total stock option expense		$	101,191			$	143,435			$	310,076

X

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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