Investments in Securities and Derivative Instruments - Narrative (Details) - USD ($) $ in Thousands		2 Months Ended	3 Months Ended
	Mar. 30, 2023	Feb. 24, 2022	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Jan. 07, 2022	Aug. 31, 2021
Derivatives, Fair Value
Long-term debt, gross			$ 112,486		$ 113,459
Derivative loss		$ 100
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]			Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Repayments of long-term debt			$ 2,519	$ 1,261
Unrealized gain on interest rate swaps, net of tax			1	24
Gain from equity investments			200	500
Loss from equity investments			300	$ 700
Investments in marketable equity securities at fair value			1,600		1,900
Unsecured debt | Contrail Aviation Inc.
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)						4.68%
Long-term debt, gross			23,710		28,394	$ 43,600
Unsecured debt | Parent company
Derivatives, Fair Value
Long-term debt, gross			49,780		45,679
Interest rate swap
Derivatives, Fair Value
Unrealized gain on other comprehensive (loss)			800
Interest rate swap | Level 2
Derivatives, Fair Value
Derivative asset			$ 1,700		1,900
Term Note A - MBT | Unsecured debt | Parent company
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)			3.42%				3.42%
Long-term debt, gross			$ 6,750		6,955
Term Note A - MBT | Interest rate swap | Unsecured debt
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)			4.56%
Term Note D - MBT | Unsecured debt | Parent company
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)			5.09%
Long-term debt, gross			$ 1,254		$ 1,271
Term Note G | Unsecured debt | Contrail Aviation Inc.
Derivatives, Fair Value
Repayments of long-term debt	$ 6,700