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INVESTMENTS IN SECURITIES AND DERIVATIVE INSTRUMENTS (Details) - USD ($)	2 Months Ended	12 Months Ended
	Feb. 24, 2022	Mar. 31, 2022	Mar. 31, 2021	Jan. 07, 2022	Aug. 31, 2021
Derivatives, Fair Value
Long-term debt gross		$ 136,932,000	$ 88,637,000
Derivative loss	$ 100,000
Unrealized gain of interest rate swaps, net of tax		929,000	262,000
Gross gain from derivative instrument			800,000
Gross loss from derivative instrument			23,700
Gain from equity investments		2,800,000	1,200,000
Loss from equity investments		2,400,000	1,200,000
Cash margin balances related to exchange-traded equity securities		0	900,000
Fair Value, Inputs, Level 2
Derivatives, Fair Value
Derivative liability		889,000	593,000
Unsecured Debt \| Contrail Debt
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)				4.68%
Long-term debt gross		57,459,000	43,598,000	$ 43,600,000
Interest Rate Swap
Derivatives, Fair Value
Unrealized gain of interest rate swaps, net of tax		900,000	300,000
Interest Rate Swap \| Other Noncurrent Liabilities \| Fair Value, Inputs, Level 2
Derivatives, Fair Value
Derivative asset		900,000
Derivative liability			600,000
Parent Company \| Unsecured Debt
Derivatives, Fair Value
Long-term debt gross		$ 51,813,000	38,807,000
Term Note A - MBT \| Interest Rate Swap \| Unsecured Debt
Derivatives, Fair Value
Fixed interest rate		4.56%
Term Note A - MBT \| Parent Company \| Unsecured Debt
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)		3.42%			3.42%
Long-term debt gross		$ 8,542,000	6,750,000
Term Note D - MBT \| Interest Rate Swap \| Unsecured Debt
Derivatives, Fair Value
Fixed interest rate		5.09%
Term Note D - MBT \| Parent Company \| Unsecured Debt
Derivatives, Fair Value
Long-term debt gross		$ 1,405,000	1,472,000
Term Note B - MBT \| Parent Company \| Unsecured Debt
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)		3.42%			3.42%
Long-term debt gross		$ 3,014,000	$ 3,375,000