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Note 9 - Prepaid Forward Obligation (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Activity in the Carrying Value of the Prepaid Forward Liability [Table Text Block]

Prepaid forward obligation at closing of RTW Transaction

  $ 75,000  

Capitalized closing costs

    (2,599 )

Financing on prepaid forward obligation

    17,291  

Amounts paid and payable

    (3,979 )

Carrying value of prepaid forward obligation as of December 31, 2021

    85,713  

Financing on prepaid forward obligation

    16,478  

Amounts paid and payable

    (5,999 )

Carrying value of prepaid forward obligation as of September 30, 2022

  $ 96,192