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Note 7 - Convertible Debt (PIK Notes) (Details Textual) - USD ($)			1 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended	24 Months Ended
	Dec. 14, 2017	Nov. 03, 2014	Aug. 31, 2017	Feb. 28, 2017	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2013	Aug. 01, 2013
Paid-in-Kind Interest						$ 770,815	$ 2,007,329
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					24,813,373	24,813,373		18,813,373
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.15	$ 0.15		$ 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					$ 8,000,101	$ 8,000,101		1,883,630
Series 2023 PIK Note Derivative Liability [Member]
Derivative Liability, Fair Value, Gross Liability, Total					748,417	748,417		163,634
Series A Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Debt Instrument, Convertible, Conversion Price		$ 0.40
Debt Instrument, Face Amount		$ 19,848,486
Series 2023 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Debt Instrument, Convertible, Conversion Price		$ 0.59
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, Interest Rate, Stated Percentage		10.00%							10.00%
Debt Instrument, Convertible, Conversion Price		$ 0.90							$ 0.90
Debt Instrument, Face Amount		$ 19,848,486
Amortization of Debt Issuance Costs and Discounts, Total					80,142	2,239,656		5,808,294
Debt Instrument, Increase, Accrued Interest						304,977		2,797,836
Convertible Notes Payable, Total					21,458,096	21,458,096		26,909,721
Payment in Kind (PIK) Note [Member] \| Series 2023 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage										10.00%	10.00%
Debt Instrument, Convertible, Conversion Price										$ 1.40
Debt Instrument, Face Amount											$ 10,500,000
Amortization of Debt Issuance Costs and Discounts, Total								200,360
Debt Instrument, Increase, Accrued Interest					50,115	61,681		2,019,717
Convertible Notes Payable, Total					$ 14,497,104	$ 14,497,104		$ 16,090,721
Paid-in-Kind Interest	$ 577,439		$ 738,728	$ 703,550