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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
      

Fair Value Measurements at Reporting Date Using

     
      

Quoted Prices in

             
      

Active Markets

  

Significant Other

  

Significant

     
      

for Identical Assets

  

Observable Inputs

  

Unobservable Inputs

     
  

September 30, 2020

  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Amortized Cost

 

Cash equivalents:

                    

Money Market Funds

 $56,431  $56,431  $-  $-  $56,431 
                     

Investments:

                    

Bank Certificates of Deposit

 $5,503  $-  $5,503  $-  $5,516 

U.S. Treasury Bills

  15,039   15,039   -   -   15,130 

Total Investments

 $20,542  $15,039  $5,503  $-  $20,646 
                     

Other current and long-term liabilities:

                    

Contingent Consideration - Short Term

 $11,855  $-  $-  $11,855  $- 

Contingent Consideration - Long Term

  41,045   -   -   41,045   - 

Total Other current and long-term liabilities

 $52,900  $-  $-  $52,900  $- 
      

Fair Value Measurements at Reporting Date Using

     
      

Quoted Prices in

             
      

Active Markets

  

Significant Other

  

Significant

     
      

for Identical Assets

  

Observable Inputs

  

Unobservable Inputs

     
  

December 31, 2019

  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Amortized Cost

 

Cash equivalents:

                    

Money Market Funds

 $48,971  $48,971  $-  $-  $48,971 
                     

Investments:

                    

U.S. Treasury Bills

 $27,480  $27,480  $-  $-  $27,479 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Nine Months Ended

 
  

September 30, 2020

 

Balance, beginning January 1, 2020

 $- 

Additions

  69,076 

Payments

  - 

Change in fair value

  (16,176)

Balance, ending September 30, 2020

 $52,900