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STOCK-BASED COMPENSATION - Restricted shares (Details) - shares
 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted - Shares 0 0
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Non-vested, Beginning Balance - Shares 821,644 808,400
Granted - Shares   396,200
Vested - Shares (500,844) (382,956)
Non-vested, Ending Balance - Shares 320,800 821,644