Note 5 - Accrued Expenses (Details) - Accrued expenses (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued expenses [Abstract]
Research and development costs	$ 1,795	$ 651
Accrued compensation	2,566	401
Other	342	698
Total	$ 4,703	$ 1,750

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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