Note 3 - Inventories - Components of Inventories (Details) - USD ($)	Dec. 31, 2019	Jun. 30, 2019
Raw materials	$ 2,035,398	$ 1,848,340
Finished goods	6,193,573	6,604,408
Inventories, gross	8,228,971	8,452,748
Reserve for obsolete inventory	(1,527,660)	(1,601,300)
Inventories, net	$ 6,701,311	$ 6,851,448	[1]

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