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Derivative Instruments (Details Textual) (USD $) | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended |
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Jun. 30, 2012 | Aug. 30, 2011 Put Option [Member] gal | Jun. 30, 2012 Put Option [Member] | May 31, 2012 Call Option [Member] gal | Jun. 30, 2012 Call Option [Member] | Jun. 30, 2012 Call Option [Member] Maximum [Member] | Jun. 30, 2012 Call Option [Member] Minimum [Member] | Jun. 30, 2012 Natural gas and electric distribution operations [Member] Contract
Derivative Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Derivatives contracts outstanding |  |  |  |  |  |  |  | 0
Purchase quantity for propane price cap |  | 630,000 |  | 1,260,000 |  |  |  |
Strike price of put option |  |  | 1.445 |  |  | 0.99 | 0.905 |
Difference between market price and strike price |  |  | $ 118,000 |  |  |  |  |
Amount paid to purchase put option |  |  | 91,000 |  |  |  |  |
Fair Value of Call Options |  |  |  |  | 123,000 |  |  |
Payment to Purchase Call Option |  |  |  | 139,000 |  |  |  |
Ineffective portion of Call Options at fair value |  |  |  |  |  |  |  |
Derivative Instruments (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Expiration of derivative contracts | First quarter of 2013 |  |  |  |  |  |  |
Expiration of put option | 2012-03 |  |  |  |  |  |  |
Fair value of derivative | $ 0 |  |  |  |  |  |  |

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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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