Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jun. 20, 2017
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total	$ 400		$ 7,000
Warrants and Rights Outstanding	22	$ 1,951
Series K Warrants [Member] \| Monte Carlo Model [Member] \| Fair Value, Inputs, Level 3 [Member]
Warrants and Rights Outstanding	20
Convertible 2020 Notes [Member]
Long-term Debt, Fair Value	12,600		$ 13,500
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total	$ 400

Net fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as assets, net of those classified as liabilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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