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Note 9 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Fair Value Measurements of Level 3 liability-classified warrant

 

Warrant liability at December 31, 2019

 $6,116,882 

Increase in fair value of warrant liability

  1,635,652 

Exercise of warrants

   

Warrant liability at June 30, 2020

 $7,752,534