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Leases - Components of lease cost (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases        
Operating lease costs $ 165,899 $ 191,507 $ 518,524 $ 576,971
Short-term lease costs 24,781   54,541 5,518
Lease costs - discontinued operations 7,684 20,048 22,571 120,753
Total lease costs $ 198,364 $ 211,555 $ 595,636 $ 703,242