Annual report pursuant to Section 13 and 15(d)

Oil and Gas Royalty Interests - Narrative (Details)

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Oil and Gas Royalty Interests - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
a
$ / shares
Dec. 31, 2019
USD ($)
a
$ / shares
Real Estate Properties [Line Items]      
Acquisition of royalty interests $ 0 $ 16,946 $ 5,017
Additional real estate acquisitions      
Real Estate Properties [Line Items]      
Net royalty interests (in acres) | a   1,017 1,247
Acquisition in conjunction with sale of 1/8th interest royalty acres      
Real Estate Properties [Line Items]      
Acquisition of royalty interests   $ 16,900 $ 4,700
Average price per net royalty acre acquired (in USD per acre) | $ / shares   16,668 3,800