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SERIES K PREFERRED STOCK - Closings and proceeds received (Details) - Series K Preferred Stock [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 27, 2017
Feb. 24, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Class of Stock [Line Items]          
Preferred stock, shares issued (in shares)     4,100 150 4,100
Proceeds from issuance of preferred stock     $ 4,100,000 $ 150,000  
Private placement [Member]          
Class of Stock [Line Items]          
Preferred stock, shares issued (in shares)     4,250   4,250
Proceeds from issuance of preferred stock $ 15,000,000 $ 1,000,000     $ 4,250,000