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LAND AND SUBSURFACE INTERESTS - Subsurface Interests (Details)
3 Months Ended 6 Months Ended 12 Months Ended 69 Months Ended
Sep. 20, 2016
Jun. 30, 2017
USD ($)
a
county
Jun. 30, 2016
USD ($)
a
Jun. 30, 2017
USD ($)
a
county
Jun. 30, 2016
USD ($)
a
Dec. 31, 2011
Jun. 30, 2017
USD ($)
a
county
Lease income              
Number of acres with operating oil wells | a   800 800 800 800   800
Oil exploration              
Subsurface interests              
Lease term 8 years            
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   $ 201,000 $ 303,000 $ 400,000 $ 606,000    
Surface land over subsurface interests              
Subsurface interests              
Acres | a   500,000   500,000     500,000
Number of counties in which Subsurface Interests are owned | county   20   20     20
Lease income              
Revenues received from royalties   $ 18,000 $ 11,000 $ 49,000 16,000    
Cash payments received for release of surface entry rights       $ 0 $ 450,000    
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     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     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     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     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     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     15,000
Lease Payment             $ 806,683
Drilling Penalty             $ 150,000