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SHAREHOLDERS' EQUITY - Non-vested Options Activity (Details) - € / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SHAREHOLDERS' EQUITY      
Non-vested options outstanding (in shares) 455,000 575,000 593,750
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share) € 1.58 € 1.47 € 1.53
Non-vested options granted (in shares) 0 155,000 165,000
Non-vested options granted, weighted average grant-date fair value (in EUR per share) € 0 € 1.93 € 1.33
Non-vested options vested (in shares) (235,000) (204,000) (180,000)
Non-vested options vested, weighted average grant-date fair value (in EUR per share) € 1.58 € 1.52 € 1.56
Non-vested options forfeited (in shares) (3,750) (70,600) (3,750)
Non-vested options forfeited, weighted average grant-date fair value (in EUR per share) € 1.54 € 1.58 € 1.29
Non-vested options outstanding (in shares) 216,250 455,000 575,000
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share) € 1.59 € 1.58 € 1.47