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Note 7 - Income Taxes (Details) - Deferred Taxes (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:        
Net operating losses $ 62,719us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 56,294us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Fixed asset basis difference 6,518us-gaap_DeferredTaxAssetsOther 6,559us-gaap_DeferredTaxAssetsOther    
Contributions carryover 2us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 2us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards    
Deferred compensation 2,659us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 2,354us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits    
Accrued liabilities 41us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 63us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities    
Total deferred tax assets 71,939us-gaap_DeferredTaxAssetsGross 65,272us-gaap_DeferredTaxAssetsGross    
Valuation allowance for deferred tax assets (71,939)us-gaap_DeferredTaxAssetsValuationAllowance (65,272)us-gaap_DeferredTaxAssetsValuationAllowance (60,041)us-gaap_DeferredTaxAssetsValuationAllowance (54,788)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet