Annual report pursuant to Section 13 and 15(d)

Oil and Gas Activities (Unaudited) (Details)

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Oil and Gas Activities (Unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Impairment expense         $ 17,400,000
Exploration costs previously capitalized       $ 0 20,000
Costs capitalized for exploratory wells       0  
United States          
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Impairment expense       $ 3,400,000  
United Kingdom          
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Exploration costs previously capitalized     $ 20,000    
Capitalized costs related to petroleum license         $ 700,000
Nautilus Poplar, LLC (NP)          
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Ownership percentage, sold in period 100.00%        
One Stone Exchange Agreement          
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Impairment expense $ 7,800,000 $ 7,800,000      
Exploration costs previously capitalized $ 3,400,000 $ 3,400,000      
One Stone Exchange Agreement | Nautilus Poplar, LLC (NP)          
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Ownership percentage, sold in period 100.00%        
Series A Preferred Stock          
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]          
Percent of shares transferred 100.00%