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SHAREHOLDERS' EQUITY - Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - € / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Non-vested options granted (in shares) 0 155,000 165,000
Share-based Payment Arrangement, Option [Member]      
Outstanding - number (in shares) 1,273,900 1,347,600 1,207,600
Outstanding - Weighted average exercise price (in EUR per share) € 2.78 € 2.61 € 2.61
Non-vested options granted (in shares)   155,000 165,000
Granted - Weighted average exercise price (in EUR per share)   € 3.90 € 2.65
Exercised - number (in shares) (23,750) (143,700)  
Exercised - Weighted average exercise price (in EUR per share) € 2.54 € 2.16  
Forfeited - number (in shares) (21,250) (85,000) (25,000)
Forfeited - Weighted average exercise price (in EUR per share) € 2.55 € 1.94 € 3.05
Expired - number (in shares) (42,000)    
Expired - Weighted average exercise price (in EUR per share) € 2.38    
Outstanding - number (in shares) 1,186,900 1,273,900 1,347,600
Outstanding - Weighted average exercise price (in EUR per share) € 2.81 € 2.78 € 2.61
Exercisable - number (in shares) 970,650 818,900 772,600
Exercisable - Weighted average exercise price (in EUR per share) € 2.73 € 2.60 € 2.44
Share purchase options available for grant - number (in shares) 292,428 250,428 250,428