Business Segments - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income from operations:
Total segment operating income	$ 4,572	$ 6,714	$ 10,138	$ 7,239
(Gain) on sale of former joint venture facility	0	0	(3,477)	0
Interest expense - net	(1,493)	(1,574)	(2,618)	(2,962)
Other income (expense) - net	84	(1,084)	337	(2,933)
Public company costs	(1,621)	(1,217)	(2,840)	(1,873)
Corporate executive management costs	(1,885)	(1,155)	(3,292)	(1,521)
Corporate management stock-based compensation	(880)	(604)	(1,479)	(1,148)
Other	(166)	(54)	(242)	(17)
Income before income taxes	3,163	4,056	7,857	1,344
Depreciation/Amortization:
Depreciation/amortization	3,485	3,859	7,076	7,729
Expenditures for Long-Lived Assets:
Expenditures for long-lived assets	2,054	796	4,766	1,495
Operating Segments
Income from operations:
Total segment operating income	9,124	9,744	14,514	11,798
Depreciation/Amortization:
Depreciation/amortization	3,018	3,412	6,151	6,841
Expenditures for Long-Lived Assets:
Expenditures for long-lived assets	1,480	708	4,049	1,066
Unallocated corporate assets
Depreciation/Amortization:
Depreciation/amortization	467	447	925	888
Expenditures for Long-Lived Assets:
Expenditures for long-lived assets	$ 574	$ 88	$ 717	$ 429