| Note 12 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | 
|---|---|---|
| Deferred Tax Assets and Liabilities [Abstract] | ||
| Net operating losses | $ 4,611us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 6,001us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 
| Environmental and closure reserves | 2,520us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 2,387us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 
| Other | 3,129us-gaap_DeferredTaxAssetsOther | 3,626us-gaap_DeferredTaxAssetsOther | 
| Deferred tax liabilities: | ||
| Depreciation and amortization | (2,322)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (3,762)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 
| Goodwill and indefinite lived intangible assets | (5,006)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | (4,467)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | 
| Investment | (25)us-gaap_DeferredTaxAssetsInvestments | (50)us-gaap_DeferredTaxAssetsInvestments | 
| Prepaid expenses | (17)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (20)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | 
| 2,890us-gaap_DeferredIncomeTaxLiabilities | 3,715us-gaap_DeferredIncomeTaxLiabilities | |
| Valuation allowance | (7,896)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | (8,182)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | 
| Net deferred income tax liabilities | $ (5,006)us-gaap_DeferredTaxLiabilities | $ (4,467)us-gaap_DeferredTaxLiabilities | 
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- Details 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments). No definition available. 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets including goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses. No definition available. 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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