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Note 8 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Level 3 Liabilities

 

(in thousands)

 

Warrant Derivative Liabilities

 
     

Balance at December 31, 2020

 $1,847 

Unrealized gain on warrants

  (573)

Reclassification of warrant liability to additional paid-in capital upon Warrant Modification

  (1,274

)

Balance at September 30, 2021

 $-