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Investments in Securities and Derivative Instruments - Textual (Details) - USD ($)	2 Months Ended	3 Months Ended
	Feb. 24, 2022	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Jan. 07, 2022	Aug. 31, 2021
Derivatives, Fair Value
Long-term debt, gross		$ 141,246,000		$ 136,932,000
Derivative loss	$ 100,000
Unrealized gain on interest rate swaps, net of tax		475,000	$ 11,000
Gain from equity investments		43,000	400,000
Loss from equity investments		44,000	49,000
Cash margin balances related to exchange-traded equity securities		0	22,000
Unsecured Debt \| Contrail Aviation Inc.
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)					4.68%
Long-term debt, gross		59,793,000		57,459,000	$ 43,600,000
Unsecured Debt \| Parent Company
Derivatives, Fair Value
Long-term debt, gross		54,335,000		51,813,000
Interest Rate Swap
Derivatives, Fair Value
Unrealized gain on interest rate swaps, net of tax		500,000	$ 11,000
Interest Rate Swap \| Other Assets \| Level 2
Derivatives, Fair Value
Derivative asset		$ 1,600,000		900,000
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		$ 8,350,000		8,542,000
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		$ 1,388,000		$ 1,405,000