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Investments in Securities and Derivative Instruments - Textual (Details) - USD ($)	3 Months Ended						9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2021	Mar. 31, 2021
Derivatives, Fair Value
Unrealized (loss) gain on interest rate swaps	$ (20,000)	$ 46,000	$ 11,000	$ 71,000	$ 55,000	$ (26,000)	$ 37,000	$ 100,000
Gain from equity investments	1,700,000			800,000			2,500,000	1,600,000
Loss from equity investments	1,900,000			300,000			2,100,000	1,100,000
Margin accounts outstanding	0			700,000			0	700,000
Cash margin balances related to exchange-traded equity securities	0			1,300,000			0	1,300,000
Level 1
Derivatives, Fair Value
Gross gain from derivative instrument				100,000				800,000
Gross loss from derivative instrument				$ 1,600				$ 23,700
Interest Rate Swap
Derivatives, Fair Value
Unrealized (loss) gain on interest rate swaps	(20,000)						37,000
Interest Rate Swap \| Level 2 \| Other non-current liabilities
Derivatives, Fair Value
Derivative liability	$ 400,000						$ 400,000			$ 600,000
Unsecured Debt \| Term Note A - MBT \| Parent Company
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)	3.42%						3.42%		3.42%
Unsecured Debt \| Term Note D - MBT \| Parent Company
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)	5.09%						5.09%
Unsecured Debt \| Interest Rate Swap \| Term Note A - MBT
Derivatives, Fair Value
Interest rate stated percentage (as a percentage)	4.56%						4.56%