Note 6 - Fair Value Measurements and Financial Instruments - Derivatives Measured at Fair Value (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Balance at beginning of year	$ 2,176,552	$ 5,138,857
Net unrealized gain included in operations	(228,277)	(3,229,043)
Balance at end of year	2,047,264	2,176,552
Series 2023 PIK Note Derivative Liability [Member] \| Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series 2023 Notes	13,155	18,807
Series A PIK Note Derivative Liability [Member] \| Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series 2023 Notes	$ 85,834	$ 247,931

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.

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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.

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