Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Fair Value Measurements Using Level 3 Inputs (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Derivative Financial Instruments, Liabilities [Member]
Opening Balance	$ 1,951
Transfers into Level 3
Transfers out of Level 3
Included in earnings	2,976
Included in other comprehensive income
Purchases
Issues
Sales
Settlements	(4,905)
Closing balance	22
Embedded Derivative, 2020 Convertible Notes [Member]
Opening Balance	5,224
Transfers into Level 3
Transfers out of Level 3
Included in earnings	(2,637)
Included in other comprehensive income
Purchases
Issues
Sales
Settlements	(2,193)
Closing balance	$ 394

Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability 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 gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability 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 liability 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 purchases of financial instrument classified as a liability 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 settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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