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Note 10 - Troubled Debt Restructuring (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Debtor Troubled Debt Restructuring, Current Period [Table Text Block]
   
December 31, 2019
   
December 31, 2018
 
Principal balance, 2017 Notes
  $
85,938
    $
85,938
 
Unamortized debt premium, 2017 Notes
   
886
     
-
 
Other long-term debt
   
-
     
31
 
Total long-term debt
  $
86,824
    $
85,969