Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Deferred tax assets: Net operating loss carryforwards	$ 9,801,000	$ 8,713,000
Deferred tax assets: Capital loss carryforwards	614,000	1,074,000
Deferred tax assets: Investment impairment reserve	671,000	1,156,000
Deferred tax assets: Accruals and reserves	893,000	871,000
Deferred tax assets: Interest expense	2,684,000	1,498,000
Deferred tax assets: Tax credits	554,000	563,000
Deferred tax assets: Unrealized loss on marketable securities		1,591,000
Deferred tax assets: Other	225,000	221,000
Deferred tax assets: Valuation allowance	(951,000)	(497,000)
Deferred Tax Assets, Net of Valuation Allowance, Total	14,491,000	15,190,000
Deferred tax liabilities: Equity earnings	(5,626,000)	(4,306,000)
Deferred tax liabilities: Deferred gains on real estate sale and depreciation	(5,027,000)	(6,249,000)
Deferred tax liabilities: Unrealized gain on marketable securities	(1,531,000)
Deferred tax liabilities: State taxes	(167,000)	(252,000)
Deferred Tax Liabilities, Gross	(12,351,000)	(10,807,000)
Net deferred tax asset	$ 2,140,000	$ 4,383,000