Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Deferred tax assets: Net operating loss carryforwards	$ 8,713,000	$ 6,810,000
Deferred tax assets: Capital loss carryforwards	1,074,000	1,283,000
Deferred tax assets: Investment impairment reserve	1,156,000	1,295,000
Deferred tax assets: Accruals and reserves	871,000	1,095,000
Deferred tax assets: Interest expense	1,498,000	162,000
Deferred tax assets: Tax credits	563,000	619,000
Deferred tax assets: Unrealized loss on marketable securities	1,591,000	547,000
Deferred tax assets: Other	221,000	231,000
Deferred tax assets: Valuation allowance	(497,000)	(524,000)
Deferred Tax Assets, Net of Valuation Allowance, Total	15,190,000	11,518,000
Deferred tax liabilities: Equity earnings	(4,306,000)	(3,188,000)
Deferred tax liabilities: Deferred gains on real estate sale and depreciation	(6,249,000)	(6,844,000)
Deferred tax liabilities: State taxes	(252,000)	(18,000)
Deferred Tax Liabilities, Gross	(10,807,000)	(10,050,000)
Net deferred tax asset	$ 4,383,000	$ 1,468,000