Related party disclosures (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Due to Related Parties [Abstract]
Unpaid compensation cost	$ 30,000	$ 1,114,659
Due from Related Parties [Abstract]
Prepayment	0	67,781
Related Party Transaction [Abstract]
Related party transaction amount	5,600,000
Vassilios Gregoriou [Member]
Due to Related Parties [Abstract]
Unpaid compensation cost	0	613,971
Christos Kaskavelis [Member]
Due to Related Parties [Abstract]
Unpaid compensation cost	0	75,160
Emory Sayre De Castro [Member]
Due to Related Parties [Abstract]
Unpaid compensation cost	0	425,528
Charalampos Antoniou [Member]
Due to Related Parties [Abstract]
Unpaid compensation cost	30,000	0
Due from Related Parties [Abstract]
Prepayment	$ 0	$ 67,781