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Warrants - Changes in warrant liability (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Warrants      
Balance, beginning of period $ 261,569 $ 374,694  
Balance, end of period 262,909 261,569 $ 374,694
Level 3      
Warrants      
Balance, beginning of period 261,569 374,694 287,750
Additional warrants issued   0  
Change in fair value 1,340 (113,125) 86,944
Balance, end of period $ 262,909 $ 261,569 $ 374,694