Note 7 - Other Assets - Investments (Details) - USD ($)	Jun. 30, 2023	Jun. 30, 2022
Investments, cost	$ 11,606,809	$ 5,039,309
Investments, gross unrealized gains	105,295	32,697
Investments, gross unrealized losses	(231,123)	(6,075)
Investments	11,480,981	5,065,931
Money Market Funds [Member]
Investments, cost	3,402,472	1,051,017
Investments, gross unrealized gains	0	0
Investments, gross unrealized losses	0	0
Investments	3,402,472	1,051,017
Other Short Term Investments [Member]
Investments, cost	280,401	271,346
Investments, gross unrealized gains	0	0
Investments, gross unrealized losses	(1,653)	(1,919)
Investments	278,748	269,427
US Treasury and Government Short-Term Debt Securities [Member]
Investments, cost	1,952,010	2,470,020
Investments, gross unrealized gains	16,950	0
Investments, gross unrealized losses	0	(4,156)
Investments	1,968,960	2,465,864
Other Equities [Member]
Investments, cost	5,971,926	1,246,926
Investments, gross unrealized gains	88,345	32,697
Investments, gross unrealized losses	(229,470)	0
Investments	$ 5,830,801	$ 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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, before tax, of unrealized loss 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).

+ References

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Amortized cost of 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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