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Note 6 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured on Recurring Basis (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Derivative Instrument    
Interest rate swap, net liability*    [1]  
Derivative Instrument    
Interest rate swap, net asset*      [1]
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative Instrument    
Interest rate swap, net liability* 9,895us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1]  
Derivative Instrument    
Interest rate swap, net asset*   6,650us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1]
Fair Value, Inputs, Level 2 [Member]    
Derivative Instrument    
Interest rate swap, net liability* 9,895us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Derivative Instrument    
Interest rate swap, net asset*   6,650us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Derivative Instrument    
Interest rate swap, net liability*    [1]  
Derivative Instrument    
Interest rate swap, net asset*      [1]
Interest Rate Swap [Member]    
Derivative Instrument    
Interest rate swap, net liability*    [1]  
Derivative Instrument    
Interest rate swap, net asset*   $ 6,650us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
[1]
[1] Note: The interest rate swap as of December 31, 2014 consists of long-term assets of $0 and current liabilities of $9,895 (classified as Current portion of interest rate swap). The interest rate swap as of December 31, 2013 consists of current liabilities of $11,966 (classified as Current portion of interest rate swap), and long-term assets of $18,616 (classified as Long-term portion of interest rate swap).