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Leases - Components of lease cost (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Leases        
Operating lease costs $ 187,448 $ 176,641 $ 354,197 $ 352,625
Short-term lease costs 25,186 25,331 50,284 29,760
Lease costs - discontinued operations 10,095 7,473 19,582 14,887
Total lease costs $ 222,729 $ 209,445 $ 424,063 $ 397,272