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Note 7 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |
Open Tax Year | 2012 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |
Open Tax Year | 2015 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards | $ 242,900,000 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Earliest Tax Year [Member] |  |
Open Tax Year | 2011 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Latest Tax Year [Member] |  |
Open Tax Year | 2015 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards | $ 149,000,000 |
Deferred Tax Assets, Net | 0 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 0 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 8,566,000 | $ 6,667,000
Unrecognized Tax Benefits | $ 2,800,000 |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before 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=6907707&loc=d3e32537-109319 + Details
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