Note 9 - Cash Dividends (Details Textual) - USD ($)	1 Months Ended	9 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2020
Payments of Dividends, Total		$ 3,958,000	$ 3,882,000
Dividends Accrued		$ 59,077	$ 40,798
Forecast [Member]
Annual Indicated per Share Dividend Rate (in dollars per share)				$ 0.20
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate (in dollars per share)	$ 0.05
Dividends Payable, Date to be Paid	May 12, 2020
Dividends Payable, Date of Record	May 04, 2020