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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 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    
    March 31, 2020   (Level 1)   (Level 2)   (Level 3)   Amortized Cost
Cash equivalents:                                        
Bank Certificates of Deposit   $
250
    $
-
    $
250
    $
-
    $
250
 
Money Market Funds    
51,682
     
51,682
     
 
     
 
     
51,682
 
Total Cash equivalents   $
51,932
    $
51,682
    $
250
    $
-
    $
51,932
 
                                         
Investments:                                        
Bank Certificates of Deposit   $
1,250
    $
-
    $
1,250
    $
-
    $
1,250
 
U.S. Treasury Bills    
25,202
     
25,202
     
-
     
-
     
25,027
 
Total Investments   $
26,452
    $
25,202
    $
1,250
    $
-
    $
26,277
 
                                         
Other current and long-term liabilities:                                        
Contingent Consideration - Short Term   $
4,303
    $
-
    $
-
    $
4,303
    $
4,303
 
Contingent Consideration - Long Term    
40,251
     
-
     
-
     
40,251
     
40,251
 
Total Other current and long-term liabilities   $
44,554
    $
-
    $
-
    $
44,554
    $
44,554
 
        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]
    March 31,
    2020
Balance, beginning   $
-
 
Additions    
69,076
 
Payments    
-
 
Change in fair value    
(24,522
)
Balance, ending   $
44,554