Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	[2]
Net Sales	$ 21,842,097	$ 23,522,631	[1]
UNITED STATES
Net Sales	15,255,741	16,584,115
Non-US [Member]
Net Sales	$ 6,586,356	$ 6,938,516

[1] As adjusted for the retrospective adoption of ASC 606

[2] As adjusted for the retrospective adoption of ASC 606