Note 9 - Deferred Compensation (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Deferred Compensation Arrangement with Individual, Distribution Paid	$ 150,000	$ 150,000	[1]
Former Board of Directors Chairman [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.60%
Deferred Compensation Arrangement with Individual, Distribution Paid	$ 150,000	150,000
Deferred Compensation Arrangement with Individual, Recorded Liability	540,379	672,884
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 17,495	102,293
Officer [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.80%
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 2,029,583	1,871,125
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 158,458	$ 147,298
Deferred Compensation, Cash Compensation, Percent of Base Salary Times Number of Years of Service	2.00%

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