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Note 5 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

(in thousands)

    

Balance at December 31, 2022

  243 

Interest accrued on face value of 5% Notes

  844 

Change in fair value of Level 3 liabilities

  (915)

Balance at September 30, 2023

 $172