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Note 7 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 63,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | $ 63,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Reserves not deductible until paid | 269,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | 236,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Net operating loss carryforwards |  |
Federal | 2,252,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 1,851,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State | 726,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 604,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Federal tax credit | 340,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 296,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Capital loss carryforward | 10,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 10,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other | 11,000 us-gaap_DeferredTaxAssetsOther | 31,000 us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets | 3,671,000 us-gaap_DeferredTaxAssetsGross | 3,091,000 us-gaap_DeferredTaxAssetsGross
Less valuation allowance | (1,418,000)us-gaap_DeferredTaxAssetsValuationAllowance | (942,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets net of valuation allowance | 2,253,000 us-gaap_DeferredTaxAssetsNet | 2,149,000 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Property and equipment | (2,188,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (2,141,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other | (57,000)us-gaap_DeferredTaxLiabilitiesOther |
Gross deferred tax liabilities | (2,245,000)us-gaap_DeferredIncomeTaxLiabilities | (2,141,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset | $ 8,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 8,000 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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