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Leases - Components of lease cost (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases        
Operating lease costs $ 176,641 $ 194,859 $ 352,625 $ 385,464
Short-term lease costs 25,331 1,402 29,760 5,518
Lease costs - discontinued operations 7,473 47,418 14,887 100,705
Total lease costs $ 209,445 $ 243,679 $ 397,272 $ 491,687