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Note 7 - Fair Value Accounting (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
June 30, 2020 (unaudited)
 
December 31, 2019
   
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Financial liabilities:
     
 
     
 
     
 
     
 
2017 Notes (Level 3)
  $
88,446
  $
17,239
  $
86,824
  $
21,289
Fair Value Measurements, Nonrecurring [Table Text Block]
   
June 30, 2020 (unaudited)
   
Fair Value (Level 3)
 
Gains and (Losses)
Goodwill
  $
-
  $
(3,905
)