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Note 7 - Convertible Debt (PIK Notes) (Details Textual) - USD ($)			1 Months Ended		3 Months Ended		12 Months Ended	24 Months Ended
	Dec. 14, 2017	Nov. 03, 2014	Aug. 31, 2017	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2013	Aug. 01, 2013
Paid-in-Kind Interest					$ 61,681	$ 762,458
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					18,313,373		18,813,373
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.14		$ 0.14
Warrants Issued to Series 2023 Notes Holders [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							3,720,000
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 0.10
Warrants and Rights Outstanding							$ 224,290
Series A PIK Note Derivative Liability [Member]
Derivative Liability, Fair Value, Gross Liability, Total					$ 9,351,128		1,883,630
Series 2023 PIK Note Derivative Liability [Member]
Derivative Liability, Fair Value, Gross Liability, Total					876,063		163,634
Series A Notes [Member]
Debt Instrument, Convertible, Conversion Price		$ 0.40
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Debt Instrument, Face Amount		$ 19,848,486
Series 2023 Notes [Member]
Debt Instrument, Convertible, Conversion Price		$ 0.59
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Debt Instrument, Face Amount		$ 10,500,000
Payment in Kind (PIK) Note [Member]
Proceeds from Convertible Debt								$ 23,000,000
Payment in Kind (PIK) Note [Member] \| Series A Notes [Member]
Proceeds from Convertible Debt		$ 12,500,000
Debt Instrument, Convertible, Conversion Price		$ 0.90						$ 0.90
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Debt Instrument, Face Amount		$ 19,848,486
Amortization of Debt Issuance Costs and Discounts, Total					2,159,514		5,808,294
Convertible Notes Payable, Total					21,073,037		26,909,721
Debt Instrument, Increase, Accrued Interest							2,797,836
Payment in Kind (PIK) Note [Member] \| Series 2023 Notes [Member]
Debt Instrument, Convertible, Conversion Price									$ 1.40
Debt Instrument, Interest Rate, Stated Percentage									10.00%	10.00%
Debt Instrument, Face Amount										$ 10,500,000
Amortization of Debt Issuance Costs and Discounts, Total					54,166		200,360
Convertible Notes Payable, Total					14,446,989		16,090,721
Debt Instrument, Increase, Accrued Interest					$ 61,681		$ 2,019,717
Paid-in-Kind Interest	$ 577,439		$ 738,728	$ 703,550