Note 7 - Other Assets - Investments (Details) - USD ($)	Dec. 31, 2022	Jun. 30, 2022
Investments, cost	$ 4,319,200	$ 5,039,309
Investments, gross unrealized gains	29,500	32,697
Investments, gross unrealized losses	(1,702)	(6,075)
Investments	4,346,998	5,065,931
Short-term treasury bills	4,346,998	5,065,931
Money Market Funds [Member]
Investments, cost	1,062,336	1,051,017
Investments, gross unrealized gains	0	0
Investments, gross unrealized losses	0	0
Investments	1,062,336	1,051,017
Short-term treasury bills	1,062,336	1,051,017
Other Short Term Investments [Member]
Investments, cost	536,599	271,346
Investments, gross unrealized gains	0	0
Investments, gross unrealized losses	(1,702)	(1,919)
Investments	534,897	269,427
Short-term treasury bills	534,897	269,427
US Treasury and Government Short-Term Debt Securities [Member]
Investments, cost	1,473,339	2,470,020
Investments, gross unrealized gains	6,721	0
Investments, gross unrealized losses	0	(4,156)
Investments	1,480,060	2,465,864
Short-term treasury bills	1,480,060	2,465,864
Other Equities [Member]
Investments, cost	1,246,926	1,246,926
Investments, gross unrealized gains	22,779	32,697
Investments, gross unrealized losses	0	0
Investments	1,269,705	1,279,623
Short-term treasury bills	$ 1,269,705	$ 1,279,623

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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