Note 4 - Income Taxes (Details Textual) $ in Thousands	6 Months Ended
Jun. 30, 2017 USD ($)
Unrecognized Tax Benefits	$ 2,800
Deferred Tax Assets, Net	0
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 262,000
Open Tax Period	3 years
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member] \| Earliest Tax Year [Member]
Open Tax Year	2013
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member] \| Latest Tax Year [Member]
Open Tax Year	2016
State and Local Jurisdiction [Member] \| Internal Revenue Service (IRS) [Member]
Open Tax Period	4 years
State and Local Jurisdiction [Member] \| California Franchise Tax Board [Member]
Operating Loss Carryforwards	$ 151,000
State and Local Jurisdiction [Member] \| California Franchise Tax Board [Member] \| Earliest Tax Year [Member]
Open Tax Year	2012
State and Local Jurisdiction [Member] \| California Franchise Tax Board [Member] \| Latest Tax Year [Member]
Open Tax Year	2016

The period of time that certain aspects of the business may be under review for tax purposes.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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