Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Insurance collateral deposits	$ 405	$ 721
Excess loss fund	622	622
Accumulated interest income	489	489
State collateral deposits	36	36
Materials and supplies	675	574
Debt issuance costs	260	292
Other	290	293
Total other assets	$ 2,777	$ 3,027