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Investment in American Shale Oil, LLC (Details Textual)
$ in Millions
 1 Months Ended 12 Months Ended
Feb. 23, 2016
USD ($)
Mar. 31, 2009
USD ($)
Jan. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
a
Minimum [Member] | Subsequent Event [Member]        
Schedule of investment (Textual)        
Remediation and reclamation costs      
Maximum [Member] | Subsequent Event [Member]        
Schedule of investment (Textual)        
Remediation and reclamation costs $ 2.0      
AMSO, LLC [Member]        
Schedule of investment (Textual)        
Area of land awarded for lease | a       160
Lease expiration period       10 years
Extension period of lease       5 years
Area of land subject to commercial lease | a       5,120
Ownership interest of company in AMSO, LLC       50.00%
Percentage of initial expenditure funded by holding company       20.00%
Initial expenditures       $ 50.0
Percentage of funding provided by holding company for next increased expenditures       35.00%
Amount of expenditures to be funded 35% by holding company       $ 50.0
Expenditures in excess of this amount to be funded 50% by holding company       $ 100.0
Percentage of funding to AMSO, LLC's for converting research, development and demonstration lease to a commercial lease       40.00%
Cumulative contributions of AMSO and Total to AMSO, LLC       $ 82.9
Aggregate amount of expenditures to be funded 38% by holding company       $ 0.3
Percentage of holding company share of required funding paid       28.00%
New equity method investment ownership percentage after dilution       41.30%
Expenditures in excess of this amount to be funded by holding company dilution percentage       $ 100.0
New percentage of funding for approved expenditures in excess of $100 million       28.90%
Amount of expenditures allocated to holding company after dilution     $ 12.1  
TOTAL S.A. [Member]        
Schedule of investment (Textual)        
Ownership interest of company in AMSO, LLC   50.00%   50.00%
Capital contributions to AMSO, LLC   $ 3.2    
Description of ownership exchange transaction   All owners of equity interests in AMSO, LLC other than AMSO exchanged their ownership interest for a proportionate share of a 1% override on AMSO, LLC's future revenue.    
Amount of expenditures funded by holding company       $ 4.6
New equity method investment ownership percentage after dilution       58.70%
New percentage of funding for approved expenditures in excess of $100 million       71.10%