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

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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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