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Note 9 - Prepaid Forward Obligation (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Activity in the Carrying Value of the Prepaid Forward Liability [Table Text Block]

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

 $85,713 

Financing on prepaid forward obligation

  21,559 

Amounts paid and payable (1)

  (8,349)

Carrying value of prepaid forward obligation as of December 31, 2022

  98,923 

Financing on prepaid forward obligation

  10,568 

Amounts paid and payable (1)

  (4,984)

Carrying value of prepaid forward obligation as of June 30, 2023

 $104,507