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Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Prepaid sponsored research	$ 1,028	$ 474
Vendor prepayments and deposits	801	486
Prepaid insurance	600	589
Related party receivables	20	22
Non-trade receivables	2	23
Total prepaid expenses and other current assets	$ 2,451	$ 1,594

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The amount of prepaid sponsored research classified as current.

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