Note 5 - Fair Value Measurements and Financial Instruments - Derivatives Measured at Fair Value (Details) - USD ($)	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Balance, beginning	$ 2,047,264	$ 2,176,552
Net unrealized gain (loss) included in operations	6,578,504	(1,636,841)
Balance, ending	8,748,518	564,749
Series 2023 PIK Note Derivative Liability [Member] \| Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series 2023 Notes	0	25,038
Series A PIK Note Derivative Liability [Member] \| Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series 2023 Notes	$ 122,750	$ 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
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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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
-Name Accounting Standards Codification
-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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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

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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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