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Note 7 - Income Taxes (Details) - A Reconciliation of the Income Tax Benefit to the Statutory Federal Income Tax Rate (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
A Reconciliation of the Income Tax Benefit to the Statutory Federal Income Tax Rate [Abstract]      
Expected federal income tax benefit at 34% $ (6,418)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (7,698)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (6,614)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Loss with no tax benefit provided 5,766us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 7,108us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 5,535us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
State income tax 4us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 6us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 10us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State tax benefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit (321)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Non-deductible expenses and other 652us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 590us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 1,079us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Income tax expense (benefit) $ 4us-gaap_IncomeTaxExpenseBenefit $ 6us-gaap_IncomeTaxExpenseBenefit $ (311)us-gaap_IncomeTaxExpenseBenefit