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Note 12 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 12 - Income Taxes (Details) [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 2,257,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 1,642,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 14,487,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 14,475,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Deferred Tax Assets, Tax Credit Carryforwards, Research 189,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 162,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Unrecognized Tax Benefits 97,000us-gaap_UnrecognizedTaxBenefits 83,000us-gaap_UnrecognizedTaxBenefits 83,000us-gaap_UnrecognizedTaxBenefits
Domestic Tax Authority [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Deferred Tax Assets, Tax Credit Carryforwards, Research 165,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
State and Local Jurisdiction [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 159,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember