Note 7 - Other Assets - Investments (Details) - USD ($)	Mar. 31, 2022	Jun. 30, 2021
Investments, cost	$ 2,816,732	$ 1,819,150
Investments, gross unrealized gains	124,781	9,946
Investments, gross unrealized losses	(583)	(170)
Investments	2,940,930	1,828,926
Money Market Funds [Member]
Investments, cost	1,299,393	1,044,748
Investments, gross unrealized gains	5,378	5,378
Investments, gross unrealized losses	0	0
Investments	1,304,771	1,050,126
Other Short Term Investments [Member]
Investments, cost	270,413	772,981
Investments, gross unrealized gains	0	4,568
Investments, gross unrealized losses	(583)	0
Investments	269,830	777,549
Other Equities [Member]
Investments, cost	1,246,926	1,421
Investments, gross unrealized gains	119,403	0
Investments, gross unrealized losses	0	(170)
Investments	$ 1,366,329	$ 1,251

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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