CAPITAL STOCK - Shares authorized, issued, and outstanding (Details)	Jun. 30, 2018 shares
Class of Stock [Line Items]
Common stock- reserved for conversion of preferred shares authorized	2,000,000
Common stock- reserved for conversion of preferred shares issued	969,834
Common stock- reserved for conversion of preferred shares outstanding	969,834
6% Prior Convertible Cumulative Preferred Stock - Series A
Class of Stock [Line Items]
Preferred shares issued	100,000
Preferred shares outstanding	100,000
6% Prior Convertible Cumulative Preferred Stock - Series B
Class of Stock [Line Items]
Preferred shares issued	100,000
Preferred shares outstanding	100,000
5% Convertible Cumulative Preferred Stock - Series A
Class of Stock [Line Items]
Preferred shares issued	58,533
Preferred shares outstanding	58,533
5% Convertible Cumulative Preferred Stock - Series B
Class of Stock [Line Items]
Preferred shares issued	9,539
Preferred shares outstanding	9,539
6% Prior Cumulative Preferred, $5 par value
Class of Stock [Line Items]
Preferred shares authorized	240,000
5% Convertible Cumulative Preferred, $20 par value
Class of Stock [Line Items]
Preferred shares authorized	150,000