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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
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Deferred tax assets: |  |  |  |
Net operating losses | $ 62,719 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 56,294 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |
Fixed asset basis difference | 6,518 us-gaap_DeferredTaxAssetsOther | 6,559 us-gaap_DeferredTaxAssetsOther |  |
Contributions carryover | 2 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards | 2 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards |  |
Deferred compensation | 2,659 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 2,354 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits |  |
Accrued liabilities | 41 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 63 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |  |
Total deferred tax assets | 71,939 us-gaap_DeferredTaxAssetsGross | 65,272 us-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 | $ 0 us-gaap_DeferredTaxAssetsNet | $ 0 us-gaap_DeferredTaxAssetsNet |  |

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