Note 7 - Subsequent Events (Details Textual) - Subsequent Event [Member] - 2020 Convertible Senior Notes [Member] $ in Millions	Apr. 26, 2016 USD ($)
Investors [Member]
Convertible Debt	$ 10
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Proceeds from Convertible Debt	$ 8
Debt Instrument, Convertible, Conversion Ratio	6.75

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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