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STOCK-BASED COMPENSATION - Employee Stock Option (Details) - Employee Stock Option [Member]
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option Shares, Nonvested shares, beginning of year | shares 59,333
Option Shares, Granted | shares 8,000
Option Shares, Vested | shares 0
Option Shares, Forfeited | shares 0
Option Shares, Nonvested shares, end of year | shares 67,333
Weighted Average Grant-Date Fair Value, Non-vested shares, beginning of year (in dollars per share) | $ / shares $ 4.41
Weighted Average Grant-Date Fair Value, Granted (in dollars per share) | $ / shares 4.60
Weighted Average Grant-Date Fair Value, Vested (in dollars per share) | $ / shares 0
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share) | $ / shares 0
Weighted Average Grant-Date Fair Value, Non-vested shares, end of year (in dollars per share) | $ / shares $ 4.44