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STOCK-BASED COMPENSATION - Employee Stock Option (Details) - Stock Option [Member]
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option Shares, Nonvested shares, beginning of year 37,666
Option Shares, Granted 0
Option Shares, Vested (2,666)
Option Shares, Forfeited (498)
Option Shares, Nonvested shares, end of year 34,502
Weighted Average Grant-Date Fair Value, Non-vested shares, beginning of year (in dollars per share) | $ / shares $ 4.45
Weighted Average Grant-Date Fair Value, Vested (in dollars per share) | $ / shares 4.60
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share) | $ / shares 4.41
Weighted Average Grant-Date Fair Value, Non-vested shares, end of year (in dollars per share) | $ / shares $ 4.44