Note 3 - Inventories - Components of Inventories (Details) - USD ($)	Mar. 31, 2020	Jun. 30, 2019
Raw materials	$ 1,915,307	$ 1,848,340
Finished goods	4,622,349	6,604,408
Inventories, gross	6,537,656	8,452,748
Reserve for obsolete inventory	(1,546,095)	(1,601,300)
Inventories, net	$ 4,991,561	$ 6,851,448	[1]

[1] As adjusted for change in accounting principle (Note 2)