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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Feb. 16, 2016 | Feb. 12, 2016 | Nov. 15, 2015 | May. 09, 2015 | Jul. 30, 2014 | Nov. 30, 2013 | Oct. 31, 2013 | Mar. 11, 2013 | Jun. 30, 2011 | Nov. 30, 2010 | Nov. 30, 2008 | Jun. 27, 2014 | May. 22, 2014 | Nov. 26, 2012 | Jun. 30, 2011 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |
Remaining number of shares available for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 |  |
Preferred stock dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,481 | $ 1,352 | $ 920
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 |  |
Collection of receivables for issuance of equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,912 |  |
GOGAS [Member] | Michael Steinhardt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  | $ 1,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total value of exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |  |
Investment options, expiration date |  |  |  |  |  |  |  |  | Apr. 09, 2015 |  |  |  |  |  |  |  |  |
Collection of receivables for issuance of equity |  |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rupert Murdoch [Member] | GOGAS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory note maturity date |  |  |  |  |  |  |  |  |  | Nov. 15, 2015 |  |  |  |  |  |  |  |
Sale of stock consideration received on transaction paid through promissory note |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Sale of subsidiary stock percentage of ownership sold |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
Promissory note interest rate |  |  |  |  |  |  |  |  |  | 1.58% |  |  |  |  |  |  |  |
Collection of receivables for issuance of equity |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lord Jacob Rothschild [Member] | GOGAS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of subsidiary stock percentage of ownership sold |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Investment options, expiration date |  |  |  |  |  |  |  |  |  | Nov. 12, 2017 |  |  |  |  |  |  |  |
Sales of stock of subsidiary |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |
Afek Oil and Gas, Ltd. [Member] | Chairman of the Board of Directors of IEI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership acquire interest of company |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Afek Oil and Gas, Ltd. [Member] | Harold Vinegar Chief Scientist [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employment agreement description |  |  |  |  |  |  | In October 2013, Vinegar purchased a 9.5% interest in Afek. |  |  |  |  |  |  |  |  |  |  |
Israel Energy Initiatives, Ltd. [Member] | Chairman of the Board of Directors of IEI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes maturity |  |  |  | November 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes interest rate |  |  |  | 0.43% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes collateral |  |  |  | Secured by 50% of the shares received in the exercise. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership acquire interest of company |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total value of exercise of stock options |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Israel Energy Initiatives, Ltd. [Member] | Harold Vinegar Chief Scientist [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, new issues |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |
Sale of subsidiary stock percentage of ownership sold |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Employment agreement description |  |  |  |  |  |  |  |  |  |  | In November 2008, Vinegar purchased a 10% interest in IEI. |  |  |  |  |  |  |
Maximum subsidiary capitalization for anti dilution protection |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |
American Shale Oil Corporation [Member] | Chairman of the Board of Directors of IEI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership acquire interest of company |  |  |  | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genie Mongolia [Member] | Chairman of the Board of Directors of IEI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership acquire interest of company |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genie Mongolia [Member] | Harold Vinegar Chief Scientist [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employment agreement description |  |  |  |  |  | In November 2013, Vinegar purchased a 9.8% interest in Genie Mongolia. |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.6376 | $ 0.6376 | $ 0.6099
Issuance of series A preferred stock in exchange for class B common stock |  |  |  |  |  |  |  | 313,376 |  |  |  | 404,732 |  |  |  |  | 405,000 | 312,000
Preferred stock dividend declared |  |  |  |  |  |  |  |  |  |  |  | $ 400 | $ 300 |  |  |  |  |
Preferred dividend paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 | $ 1,400 | $ 1,100
Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate | $ 0.1594 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 | $ 1,500 |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of series A preferred stock in exchange for class B common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.12 | $ 0.06 |
Stock issued during period, value, new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Class A [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,331 |
Number of shares repurchased, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 |
Number of stock authorized to be repurchased |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |
Common stock exchange into preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 7,150,000 |  |  |  |
Issuance of series A preferred stock in exchange for class B common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (405,000) | (312,000)
Cash dividend paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.12 | $ 0.06 |
Stock issued during period, value, new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Class B [Member] | Howard S. Jonas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options, Granted |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase shares |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase shares price per share |  |  |  |  | $ 6.82 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchase description |  |  |  |  | The 3.6 million Class B shares are subject to repurchase by the Company at $6.82 per share upon certain terminations of Mr. Jonas' employment by the Company, and such repurchase right lapses as to 0.6 million shares on December 31, 2016, 2017 and 2018. On July 30, 2014 and August 4, 2014. |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, new issues |  |  |  |  | $ 24,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total value of option granted |  |  |  |  | $ 19,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price, Granted |  |  |  |  | $ 10.30 |  |  |  |  |  |  |  |  |  |  |  |  |
Option expiration date description |  |  |  |  | Extended for an additional one year period, expiring on December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Class B [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2012-A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50 |  |
Preferred stock dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.6375 |  |
Preferred stock, dividend payment rate, variable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | seven and one-half percent (7.5%) of the quotient obtained by dividing (A) the amount by which the EBITDA for a fiscal year of the Company's retail energy provider business exceeds $32 million by (B) 8,750,000 (the Additional Dividend) |  |
Preferred stock, redemption terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The Preferred Stock is redeemable, in whole or in part, at the option of the Company following October 11, 2017 at 101% of the Liquidation Preference plus accrued and unpaid dividends, and 100% of the Liquidation Preference plus accrued and unpaid dividends following October 11, 2018. |  |

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