Stock warrants (Narrative) (Details) - USD ($)	1 Months Ended			12 Months Ended
	Apr. 23, 2023	Oct. 31, 2022	Oct. 27, 2022	Dec. 31, 2022	Dec. 31, 2021
Class of Warrant or Right [Line Items]
Fair value of warrants			$ 591,590
Fair value of warrant				$ (191,429)	$ 0
Warrants to purchase shares of common	5,684,294
Number of other warrants in connection with notes payable				479,167
Fair value of other warrants in connection with notes payable				$ 112,986
Relative value of other warrants in connection with notes payable				$ 39,626
Warrant exercise price		$ 0.18	$ 0.18
Convertible notes payable [Member]
Class of Warrant or Right [Line Items]
Total number of issuance of warrants requirement of derivative		2,250,000