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Note 8 - Income Taxes	3 Months Ended
	Mar. 31, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	8. Income Taxes Deferred income tax assets and liabilities are recognized for temporary differences between financial statements and income tax carrying values using tax rates in effect for the years such differences are expected to reverse. Due to uncertainties surrounding our ability to generate future taxable income and consequently realize such deferred income tax assets, a full valuation allowance has been established. We continue to maintain a full valuation allowance against our deferred tax assets as of March 31, 2017. The impact of an uncertain income tax position on the income tax return must be recognized at the largest amount that is more likely than not to be sustained upon audit by the relevant tax authority. An uncertain income tax position will be recognized when it is more likely than not of being sustained. In 2017, we adopted ASU 2016 - 09, which resulted in the recognition of $3.6 million of previously unrecognized tax benefits in deferred tax assets, fully offset by a valuation allowance. The disclosures included in our 2016 Annual Report on Form  10 -K for the year ended December   31, 2016 continue to be accurate for the three -month period ended March 31, 2017.

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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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