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Other information related to leases (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 1,033,514
Operating cash flows from finance leases 4,579
Financing cash flows from finance leases 25,150
Right-of-use assets obtained in exchange for lease obligations:  
Operating leases 8,855,324
Finance leases $ 0
Weighted Average Remaining Lease Term  
Operating leases 4 years 3 months 18 days
Finance leases 5 years 3 months
Weighted Average Discount Rate  
Operating leases 6.13%
Finance leases 3.00%