Note 5 - Property, Plant and Equipment - Property and Equipment Summary (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2022
Solar energy system	$ 125,911	$ 138,030
Total property, plant and equipment, gross	3,009,117	3,252,524
Accumulated depreciation	(1,755,746)	(1,860,630)
Total property, plant and equipment, net	1,253,371	1,391,894	[1]
Plant and Equipment [Member]
Plant and equipment, gross	1,744,087	1,905,921
Furniture and Fixtures [Member]
Plant and equipment, gross	244,949	254,616
Land and Building [Member]
Plant and equipment, gross	555,559	590,662
Vehicles [Member]
Plant and equipment, gross	$ 338,611	$ 363,295

[1] Derived from audited financial statements