Note 13 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Tax Expense (Benefit), Total	$ 562,962	$ 347,014
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (2,573)	$ (9,811)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 251,946	$ 2,019
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 37,792	$ 25,194
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2016 2017 2018 2019