Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Mar. 31, 2023	Jun. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 16,967,000	$ 11,049,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	16,967,000	11,049,000
Fair Value, Inputs, Level 1 [Member] | REITs and Real Estate Companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,443,000	3,289,000
Fair Value, Inputs, Level 1 [Member] | Financial Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	1,065,000	1,755,000
Fair Value, Inputs, Level 1 [Member] | Technology [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	1,139,000	815,000
Fair Value, Inputs, Level 1 [Member] | Basic Material [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	1,007,000	769,000
Fair Value, Inputs, Level 1 [Member] | Health Care [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	417,000
Fair Value, Inputs, Level 1 [Member] | Consumer Cyclical [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	496,000	693,000
Fair Value, Inputs, Level 1 [Member] | Communication Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	804,000	2,787,000
Fair Value, Inputs, Level 1 [Member] | Industrials [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	258,000	385,000
Fair Value, Inputs, Level 1 [Member] | Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	211,000	279,000
Fair Value, Inputs, Level 1 [Member] | Treasury Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	5,055,000
Fair Value, Inputs, Level 1 [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 72,000	$ 277,000