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Note 6 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Compensation $ 1,747,880 $ 2,966,139
Deferred revenue 10,630,746 2,298,341
Interest payable 0 977,724
Lease liability, current portion 434,132 419,709
Research and development vendor costs 298,626 707,685
Professional fees 447,451 288,707
Vacation 438,599 256,402
Other 933,936 722,204
Accrued expenses and other current liabilities $ 14,931,370 $ 8,636,911