Note 5 - Property, Plant and Equipment - Property and Equipment Summary (Details) - USD ($)	Jun. 30, 2022	Jun. 30, 2021
Solar energy system	$ 138,030	$ 0
Total property and equipment, gross	3,252,524	3,420,886
Accumulated depreciation	(1,860,630)	(1,847,441)
Total property and equipment, net	1,391,894	1,573,445	[1]
Plant and Equipment [Member]
Plant and equipment, gross	1,905,921	2,147,617
Furniture and Fixtures [Member]
Plant and equipment, gross	254,616	246,697
Land and Building [Member]
Plant and equipment, gross	590,662	613,891
Vehicles [Member]
Plant and equipment, gross	$ 363,295	$ 412,681

[1] Derived from audited financial statements