Income Taxes - Reconciliation of Income Tax Expense from Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Difference between total income tax expense and the amount computed by applying the statutory Federal income tax rate to income before taxes:
Income tax at statutory rate	$ 1,924	$ 17	$ 3,058
State income taxes, net of Federal benefit	802	217	948
Excess stock compensation expense	34	365	(57)
Non-deductible compensation	539	357	0
Oil and mineral depletion	(108)	(101)	(131)
Refunds	0	(78)	0
Permanent differences	26	16	26
Stock compensation true-up	641	0	0
Other	(37)	36	136
Provision (benefit) for income taxes	$ 3,821	$ 829	$ 3,980
Effective tax rate	41.70%	1011.00%	27.30%