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Investments in Securities and Derivative Instruments - Textual (Details) - USD ($)	2 Months Ended	3 Months Ended				6 Months Ended
	Feb. 24, 2022	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022	Jan. 07, 2022	Aug. 31, 2021
Derivatives, Fair Value
Long-term debt, gross		$ 153,671,000				$ 153,671,000		$ 136,932,000
Derivative loss	$ 100,000
Unrealized gain on interest rate swaps, net of tax		957,000	$ 475,000	$ 46,000	$ 11,000	1,432,000	$ 57,000
Gross gain from derivative instrument				0
Gross loss from derivative instrument							0
Gain from equity investments		43,000		400,000		86,000.0	800,000
Loss from equity investments		200,000		100,000		300,000	200,000
Level 1
Derivatives, Fair Value
Gross gain from derivative instrument		46,000				46,000
Gross loss from derivative instrument		0				0
Unsecured Debt \| Contrail Aviation Inc.
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)									4.68%
Long-term debt, gross		67,162,000				67,162,000		57,459,000	$ 43,600,000
Unsecured Debt \| Parent Company
Derivatives, Fair Value
Long-term debt, gross		59,872,000				59,872,000		51,813,000
Interest Rate Swap
Derivatives, Fair Value
Unrealized gain on interest rate swaps, net of tax		1,000,000		$ 46,000.0		1,400,000	$ 57,000.0
Interest Rate Swap \| Level 2
Derivatives, Fair Value
Derivative asset		$ 3,000,000				$ 3,000,000		900,000
Term Note A - MBT \| Unsecured Debt \| Parent Company
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)		3.42%				3.42%				3.42%
Long-term debt, gross		$ 8,157,000				$ 8,157,000		8,542,000
Term Note A - MBT \| Interest Rate Swap \| Unsecured Debt
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)		4.56%				4.56%
Term Note D - MBT \| Unsecured Debt \| Parent Company
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)		5.09%				5.09%
Long-term debt, gross		$ 1,371,000				$ 1,371,000		$ 1,405,000