Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parentheticals)

v3.8.0.1
Consolidated Balance Sheets (Parentheticals)
$ in Thousands
Dec. 31, 2017
USD ($)
a
$ / shares
shares
Dec. 31, 2016
USD ($)
a
$ / shares
shares
Property, plant and equipment, accumulated depreciation | $ $ 463 $ 165
Land (surface rights) (Acre) 10,064.78 10,064.78
Certificates of Proprietary Interest, par value (in dollars per share) | $ / shares $ 100 $ 100
Certificates of Proprietary Interest, outstanding (in shares) | shares 0 0
Sub-share Certificates in Certificates of Proprietary Interest, par value (in dollars per share) | $ / shares $ 0.0333 $ 0.0333
Sub-share Certificates in Certificates of Proprietary Interest, outstanding (in shares) | shares 7,821,599 7,927,314
Land Surface Rights [Member]    
Land (surface rights) (Acre) 877,633 877,488
Royalty Interests in Acres 1_16 [Member]    
Nonparticipating perpetual royalty interest in acres (Acre) 373,777 373,777
Royalty Interests in Acres 1_128 [Member]    
Nonparticipating perpetual royalty interest in acres (Acre) 85,414 85,414