Note 7 - Convertible Debt (PIK Notes) - Convertible Debt PIK Notes (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Nov. 03, 2014
Less: Discount	$ (6,941,703)	$ (9,755,832)
Series 2023 Notes [Member]
Derivative Liability			$ 2,055,000
Series A Notes [Member]
Derivative Liability			$ 9,212,285
Payment in Kind (PIK) Note [Member]
PIK Note Payable, Gross	43,367,095	43,000,437
Less: Discount	(6,941,703)	(9,240,138)
Less: Deferred Financing Cost	(470,192)	(515,694)
PIK Note Payable, Net	35,955,200	33,244,605
Derivative Liability	8,748,518	2,047,264
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member]
PIK Note Payable, Gross	16,152,402	16,090,721
Less: Discount	(1,453,542)	(1,538,299)
Less: Deferred Financing Cost	(201,756)	(221,280)
PIK Note Payable, Net	14,497,104	14,331,142
Derivative Liability	748,417	163,634
Payment in Kind (PIK) Note [Member] | Series A Notes [Member]
PIK Note Payable, Gross	27,214,693	26,909,716
Less: Discount	(5,488,161)	(7,701,839)
Less: Deferred Financing Cost	(268,436)	(294,414)
PIK Note Payable, Net	21,548,096	18,913,463
Derivative Liability	$ 8,000,101	$ 1,883,630