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Ordinary share (Details) - shares
Dec. 31, 2021
Mar. 03, 2021
Dec. 31, 2020
Oct. 08, 2019
Ordinary share        
Shares issued 5,322,459 2,061,900 3,260,559 1,030,950
Less: shares under treasury stock (167,700)   (167,700)  
Total 5,154,759   3,092,859