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Leases - Components of lease expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Components of lease expense
Operating lease cost	$ 231,989	$ 231,989
Variable lease cost	151,132	146,421
Total operating lease cost	383,121	378,410
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 272,870	$ 266,215

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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