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NET INCOME (LOSS) PER SHARE (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
NET INCOME (LOSS) PER SHARE        
Anti-dilutive potential shares excluded from the computation of diluted weighted average shares outstanding (in shares) 48,000 50,000 48,000 50,000