CAPITAL STOCK - Additional information (Details)	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)
Class of Stock [Line Items]
Total cumulative preferred stock dividends in arrears | $	$ 8,461,094	$ 8,333,022
6% Prior Cumulative Preferred, $5 Par Value
Class of Stock [Line Items]
Redemption price per share (in dollars per share)	$ 5.25
Preferred stock, liquidation preference per share (in dollars per share)	$ 5.25
Prior Cumulative Preferred Stock - Series A
Class of Stock [Line Items]
Number of common stock exchanged for each preferred stock held	4
Prior Cumulative Preferred Stock - Series B
Class of Stock [Line Items]
Number of common stock exchanged for each preferred stock held	3.75
5% Convertible Cumulative Preferred, $20 Par Value
Class of Stock [Line Items]
Redemption price per share (in dollars per share)	$ 21.00
Preferred stock, liquidation preference per share (in dollars per share)	$ 20.00
Number of common stock exchanged for each preferred stock held	3.795