Note 5 - Property, Plant and Equipment - Property and Equipment Summary (Details) - USD ($)	Mar. 31, 2023	Jun. 30, 2022
Solar energy system	$ 138,731	$ 138,030
Total property, plant and equipment, gross	3,294,698	3,252,524
Accumulated depreciation	(2,006,277)	(1,860,630)
Total property, plant and equipment, net	1,288,421	1,391,894	[1]
Plant and Equipment [Member]
Plant and equipment, gross	1,957,622	1,905,921
Furniture and Fixtures [Member]
Plant and equipment, gross	276,975	254,616
Land and Building [Member]
Plant and equipment, gross	561,987	590,662
Vehicles [Member]
Plant and equipment, gross	$ 359,383	$ 363,295

[1] Derived from audited financial statements