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MARGIN ACCOUNTS (Details Textual) (Fuel [Member], Swap [Member], USD $)
Dec. 31, 2014
Dec. 31, 2013
Margin Accounts [Line Items]    
Margin Deposit Assets $ 962,000us-gaap_MarginDepositAssets $ 100,000us-gaap_MarginDepositAssets
Forward Contracts [Member]    
Margin Accounts [Line Items]    
Margin Deposit Assets $ 440,000us-gaap_MarginDepositAssets
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_EnergyAxis
= us-gaap_FuelMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_SwapMember
$ 1,062,000us-gaap_MarginDepositAssets
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_EnergyAxis
= us-gaap_FuelMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_SwapMember