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STOCK-BASED COMPENSATION PLANS - Narrative (Details) - Restricted share awards
1 Months Ended 10 Months Ended 12 Months Ended
Mar. 06, 2015
shares
May 06, 2014
officer
shares
May 31, 2018
shares
Jun. 30, 2017
shares
May 31, 2016
shares
Apr. 30, 2015
shares
Mar. 06, 2015
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share-based compensation plans                    
Granted (in shares) | shares               10,134 9,585 10,176
Unrecognized compensation expense | $               $ 49,000    
Fair value of shares vested | $               150,000 $ 203,000 $ 133,000
Board of directors                    
Share-based compensation plans                    
Award granted to each independent members of the board of directors (in shares) | shares     3,378 3,195 3,392 2,000        
Granted (in shares) | shares     10,134 9,585 10,176 6,000        
Award vesting period     1 year 1 year 1 year 1 year        
Stock-based compensation expense | $               162,000 153,000 155,000
Executive officers                    
Share-based compensation plans                    
Award vesting period   2 years         2 years      
Stock-based compensation expense | $               $ 0 $ 1,000 $ 9,000
Number of executive officers | officer   2                
Common stock issued (in shares) | shares 2,000 2,000                
Share-based Compensation Award, Tranche One | Executive officers                    
Share-based compensation plans                    
Vesting rights   33.00%                
Share-based Compensation Award, Tranche Two | Executive officers                    
Share-based compensation plans                    
Vesting rights             33.00%