Leases - Components of lease cost (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases
Operating lease costs	$ 175,984	$ 190,605
Short-term lease costs	4,429	4,116
Lease costs - discontinued operations	7,414	53,287
Total lease costs	$ 187,827	$ 248,008