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STOCK-BASED COMPENSATION (Details) - Stock Option Plans [Member]
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Options, Outstanding  
Outstanding at beginning | shares 41,772
Exercised | shares 35,000
Vested at end | shares 6,772
Options, Outstanding, Weighted Average Exercise Price  
Outstanding at beginning | $ / shares $ 7.58
Exercised | $ / shares 6.60
Vested at end | $ / shares $ 12.67
Options, Weighted Average Remaining Contractual Term  
Vested at end 3 months
Options, Aggregate Intrinsic Value  
Vested at end | $ $ 0