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Note 6 - Accrued Expenses - Accrued Expenses and Other Current Liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred revenue | $ 3,764,696 | $ 3,280,947
Compensation | 2,811,700 | 2,933,738
Other | 558,362 | 486,158
Professional fees | 527,026 | 251,824
Inventory | 488,081 | 150,349
Vacation | 379,720 | 405,176
Research and development vendor costs | 256,397 | 327,606
Accrued expenses and other current liabilities | 9,252,812 | 8,285,738
Accrued Expenses and Other Current Liabilities [Member] |  |
Lease liability, current portion | $ 466,830 | $ 449,940

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