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Note 4 - Acquisition and Divestitures of Properties
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
 
4.
Acquisitions and Divestitures of Properties
 
During the year ended
December 31, 2018,
through multiple transactions, the Company acquired approximately
2,721
net mineral acres of additional leasehold and working interests in its Permian Basin region for an aggregate purchase price of 
$40.4
 million, net of post-closing adjustments. These acquisitions were accounted for as asset acquisitions. Acquisition cost of approximately
$21,000
were capitalized in connection with these transactions.
 
During
2018,
the Company divested of various non-core properties for net proceeds of approximately
$3.3
million.