Note 6 - Fair Value Measurements and Financial Instruments (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2015

Dec. 31, 2014

Fair Value, Inputs, Level 3 [Member]

Note 6 - Fair Value Measurements and Financial Instruments (Tables) [Line Items]

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at December 31, 2013	$	-
Transfer into Level 3 (a)		2,250,000
Issuance of Series A PIK Note		9,212,285
Issuance of additional Series 2023 PIK Note		44,138
Net unrealized losses included in earnings (loss)		(1,470,798	)
Balance at December 31, 2014	$	10,035,625

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair value measurement using inputs				Carrying amount
	Level 1	Level 2	Level 3		December 31, 2014		December 31, 2013
Financial instruments:
Warrant derivative *				--		--	$	950,000
Series 2023 PIK Note Derivative			$	478,149	$	478,149	$	2,250,000
Series A PIK Note Derivative			$	9,557,476	$	9,557,476		--

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at December 31, 2014	$	10,035,625
Issuance of additional Series 2023 PIK Note		26,387
Net unrealized loss		92,741
Balance at March 31, 2015	$	10,154,753

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

Series 2023 PIK Note derivative liability	Fair Value Measurements
	Using Inputs
	March 31, 2015			December 31, 2014
Market price and estimated fair value of stock	$	0.70		$	0.73
Exercise price	$	1.36		$	1.36
Term (years)		8.33			8.58
Dividend yield	$	--		$	--
Expected volatility		60.9	%		52.0	%
Risk-free interest rate		1.81	%		2.08	%

Series A PIK Note derivative liability	Fair Value Measurements
	Using Inputs
	March 31, 2015			December 31, 2014
Market price and estimated fair value of stock	$	0.70		$	0.73
Exercise price	$	0.92		$	0.92
Term (years)		3.58			3.83
Dividend yield	$	--		$	--
Expected volatility		60.9	%		52.0	%
Risk-free interest rate		1.81	%		2.08	%

Series 2023 PIK Note derivative liability	Fair Value Measurements
	Using Inputs
	December 31, 2014			December 31, 2013
Market price and estimated fair value of stock	$	0.73		$	1.10
Exercise price	$	1.36		$	1.40
Term (years)		8.58			9.58
Dividend yield	$	--		$	--
Expected volatility *		52.0	%		76.9	%
Risk-free interest rate		2.08	%		2.96	%

Series A PIK Note derivative liability	Fair Value Measurements
	Using Inputs
	December 31, 2014
Market price and estimated fair value of stock	$	0.73
Exercise price	$	0.92
Term (years)		3.83
Dividend yield	$	--
Expected volatility		52.0	%
Risk-free interest rate		2.08	%

Warrant derivative liability	Fair Value Measurements
	Using Inputs
	December 31, 2013
Market price and estimated fair value of stock	$	1.10
Exercise price	$	1.93
Term (years)		3
Dividend yield	$	--
Expected volatility *		76.9	%
Risk-free interest rate		0.78	%