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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

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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

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