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Note 4 - Investments (Tables)
12 Months Ended
Dec. 31, 2018
Equity Method Investments [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
   
Carrying Value
 
At December 31,
(in thousands)
 
201
8
   
2017
 
NKD Enterprises, LLC
  $
--
    $
25