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