Note 8 - Cash Dividends (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Payments of Ordinary Dividends, Common Stock		$ 5,184,000	$ 5,154,000
Dividends Accrued		$ 28,158	$ 50,621
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate	$ 0.05
Dividends Payable, Date to be Paid	Sep. 12, 2019
Dividends Payable, Date of Record	Sep. 03, 2019