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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
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.