Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 250	$ 424
Cash paid for federal and state income taxes	1,313	258
Cash refund for NOL carryback under CARES Act	6,907	3,712
Non-cash transactions:
Change in accounts payable related to property and equipment additions	0	(1,238)
Property and equipment acquired under finance leases	$ 1,888	$ 2,083