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SHAREHOLDERS EQUITY - Stock based compensation - Financial Performance Units (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 01, 2019
Sep. 30, 2019
Sep. 30, 2019
Financial Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     59,536
Financial Performance Units Granted Prior to 2019      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period (in years)     2 years
Percent of awards accruing at maximum threshold     50.00%
Remainder threshold awards   50.00% 50.00%
Maximum percentage of shares can be issued     150.00%
Maximum number of shares can be issued   20,800 20,800
Unrecognized compensation expense   $ 0.2 $ 0.2
Unrecognized compensation expense recognition period (in years)     2 years 3 months 18 days
Financial Performance Units Granted Prior to 2019 | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Financial performance threshold percentage     150.00%
Financial Performance Units Granted Prior to 2019 | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Financial performance threshold percentage     0.00%
Financial Performance Units Granted in 2019      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period (in years) 2 years    
Granted (in shares) 59,536    
Maximum percentage of shares can be issued     150.00%
Maximum number of shares can be issued   82,500 82,500
Stock-based compensation expense   $ 0.1  
Unrecognized compensation expense   $ 0.7 $ 0.7
Unrecognized compensation expense recognition period (in years)     4 years 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years    
Financial Performance Units Granted in 2019 | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Financial performance threshold percentage 150.00%    
Financial Performance Units Granted in 2019 | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Financial performance threshold percentage 0.00%