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Leases - Lease assets and liabilities (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current |  |
Prepaid expenses and other current assets | $ 321,173 | $ 36,097
Noncurrent |  |
Operating lease right-of-use assets | 4,043,717 | 4,439,212
Total lease right-of-use assets | 4,364,890 | 4,475,309
Current |  |
Current maturities of operating leases | 761,540 | 755,751
Noncurrent |  |
Noncurrent operating leases | 3,166,476 | 3,836,475
Total lease obligations | $ 3,928,016 | $ 4,592,226
Operating leases, weighted average remaining lease term | 16 years 9 months 18 days | 17 years 9 months 18 days
Operating leases, weighted average discount rate | 4.56% | 4.59%

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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