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LAND AND SUBSURFACE INTERESTS - Subsurface Interests (Details)
3 Months Ended 12 Months Ended 66 Months Ended
Mar. 31, 2017
USD ($)
a
county
Mar. 31, 2016
USD ($)
Dec. 31, 2011
Mar. 31, 2017
USD ($)
a
Lease income        
Number of acres with operating oil wells | a 800     800
Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Lease Payment       $ 9,020,438
Drilling Penalty       $ 1,925,000
Lease income        
Period of lease term after which lessee has option to terminate lease 1 year      
Lease income $ 199,000 $ 303,000    
Surface land over subsurface interests        
Subsurface interests        
Acres | a 500,000     500,000
Subsurface Interest in number of countries | county 20      
Lease income        
Revenues received from royalties $ 31,000 $ 5,000    
Minimum        
Subsurface interests        
Acres | a 8,200     8,200
Minimum | Oil exploration        
Lease income        
Period of lease term after which additional rental payments may be received 7 years      
Maximum | Oil exploration        
Subsurface interests        
Lease term 8 years   8 years  
Lease income        
Period of lease term after which lessee has option to terminate lease 8 years      
Lease Year 1 - 9/23/2011 - 9/22/2012 | Lee and Hendry County Florida | Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Acreage | a 136,000     136,000
Lease Payment       $ 913,657
Lease Year 2 - 9/23/2012 - 9/22/2013 | Lee and Hendry County Florida | Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Acreage | a 136,000     136,000
Lease Payment       $ 922,114
Lease Year 3 - 9/23/2013 - 9/22/2014 | Hendry County Florida | Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Acreage | a 82,000     82,000
Lease Payment       $ 3,293,000
Drilling Penalty       $ 1,000,000
Lease Year 4 - 9/23/2014 - 9/22/2015 | Hendry County Florida | Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Acreage | a 42,000     42,000
Lease Payment       $ 1,866,146
Drilling Penalty       $ 600,000
Lease Year 5 - 9/23/2015 - 9/22/2016 | Hendry County Florida | Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Acreage | a 25,000     25,000
Lease Payment       $ 1,218,838
Drilling Penalty       $ 175,000
Lease Year 6 - 9/23/2016 - 9/22/2017 | Hendry County Florida | Oil exploration        
Lease payments on the respective acreages and drilling penalties received        
Acreage | a 15,000     15,000
Lease Payment       $ 806,683
Drilling Penalty       $ 150,000