Note 5 - Fair Value Measurements and Financial Instruments - Derivatives Measured at Fair Value (Details) - USD ($)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Balance, beginning	$ 2,047,264	$ 2,176,552
Net unrealized loss included in operations	8,179,927	(895,724)
Balance, ending	10,227,191	1,283,475
Series 2023 PIK Note Derivative Liability [Member] \| Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series 2023 Notes	0	2,647
Series A PIK Note Derivative Liability [Member] \| Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series 2023 Notes	$ 0	$ 0

Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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