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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   
Amounts at
   
Fair Value Measurement Using
 
   
Fair Value
   
Level 1
   
Level 2
   
Level 3
 
As of June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Earnout payable
  $
6,282
    $
-
    $
-
    $
6,282
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Six Months
Ended
June 30, 2018
 
Balance at beginning of period
  $
11,099
 
Fair value adjustment
   
1,016
 
Payment of 2017 earnout
   
(5,833
)
         
Balance at end of period
  $
6,282