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Leases - Components of lease expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Components of lease expense        
Operating lease cost $ 247,359 $ 231,989 $ 479,349 $ 463,979
Variable lease cost 133,022 153,753 316,296 304,885
Total operating lease cost 380,381 385,742 795,645 768,864
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash outflows from operating leases $ 280,518 $ 273,676 $ 560,210 $ 546,547