Note 5 - Accrued Liabilities - Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Employee related expenses	$ 2,878us-gaap_AccruedEmployeeBenefitsCurrent	$ 3,348us-gaap_AccruedEmployeeBenefitsCurrent
Royalties	429us-gaap_AccruedRoyaltiesCurrent	2,458us-gaap_AccruedRoyaltiesCurrent
Inventory	298oxfd_AccruedInventoryCosts	88oxfd_AccruedInventoryCosts
Professional services	252us-gaap_AccruedProfessionalFeesCurrent	323us-gaap_AccruedProfessionalFeesCurrent
Rent	61us-gaap_AccruedRentCurrent	196us-gaap_AccruedRentCurrent
Other accrued liabilities	704us-gaap_OtherAccruedLiabilitiesCurrent	657us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities	$ 4,622us-gaap_AccruedLiabilitiesCurrent	$ 7,070us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. 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 for professional fees, such as for legal and accounting services received. 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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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements. 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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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. 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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- Definition

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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