Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 2,627	$ 7,317
Account receivable	8,029	11,271
Prepaid expenses	1,292	1,524
Total current assets	11,948	20,112
Royalty interests in oil and natural gas properties, net of accumulated amortization of $127,229 and $117,605 respectively	220,446	209,168
Property and equipment, net	497
Deferred tax asset, net	56,470	58,773
Other assets	2,690	3,182
Total assets	292,051	291,235
Current liabilities:
Accounts payable and accrued expenses	1,974	521
Credit facility	38,000	21,000
Other non-current liabilities	476
Total liabilities	40,450	21,521
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	132,325	137,866
Non-controlling interests	119,267	127,029
Retained earnings		4,810
Total shareholders' equity	251,601	269,714
Total liabilities and shareholders' equity	292,051	291,235
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