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Leases - Lease cost (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Lessee, Lease, Description [Line Items]          
Right-of-use operating lease assets $ 5,076,837   $ 5,076,837   $ 5,305,881
Finance lease assets 15,918   15,918   18,467
Operating and finance lease right-of-use assets $ 5,092,755   $ 5,092,755   5,324,348
Finance lease, right-of-use asset, statement of financial position [extensible list] Property and equipment, net   Property and equipment, net    
Operating lease liabilities - current $ 856,635   $ 856,635   824,326
Operating lease liabilities - noncurrent 4,867,157   4,867,157   5,090,170
Finance lease liabilities - current 7,318   7,318   7,184
Finance lease liabilities - noncurrent 10,513   10,513   12,959
Total lease obligations $ 5,741,623   $ 5,741,623   $ 5,934,639
Operating lease, liability, noncurrent, statement of financial position, extensible list Operating lease liabilities - noncurrent   Operating lease liabilities - noncurrent    
Finance lease, liability, current, statement of financial position, extensible list Other liabilities   Other liabilities    
Finance lease, liability, noncurrent, statement of financial position, extensible list Other long-term liabilities   Other long-term liabilities    
Total lease expense $ 230,529 $ 166,126 $ 461,079 $ 349,226  
Selling, general and administrative          
Lessee, Lease, Description [Line Items]          
Operating lease expense 228,633 164,076 457,267 340,597  
Amortization of finance lease assets 1,432 1,451 2,855 7,391  
Interest income, net          
Lessee, Lease, Description [Line Items]          
Interest income, net $ 464 $ 599 $ 957 $ 1,238