Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,501	$ 2,543
Account receivable	4,676	7,889
Prepaid expenses	1,035	1,182
Total current assets	8,212	11,614
Royalty interests in oil and natural gas properties, net of accumulated amortization of $140,827 and $130,342 respectively	210,808	219,192
Property and equipment, net	453	517
Deferred tax asset, net	55,962	56,352
Other assets	3,357	2,530
Total assets	278,792	290,205
Current liabilities:
Accounts payable and accrued expenses	2,162	2,206
Other current liabilities	829
Total current liabilities	2,991	2,206
Credit facility	39,000	42,500
Other non-current liabilities	984	473
Total liabilities	42,975	45,179
Commitments and contingencies (See Note 13)
Shareholders' equity:
Preferred stock, $0.0001 par value; 1,000,000 shares authorized; none issued and outstanding
Additional paid in capital	125,239	129,127
Non-controlling interests	110,569	115,890
Total shareholders' equity	235,817	245,026
Total liabilities and shareholders' equity	278,792	290,205
Class A common stock [Member]
Shareholders' equity:
Common stock, value	5	5
Total shareholders' equity	5	5
Class C common stock [Member]
Shareholders' equity:
Common stock, value	4	4
Total shareholders' equity	$ 4	$ 4