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Marketable Equity Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Marketable Equity Securities and Accumulated OCI
(in thousands)

    June 30,

    2018

 December 31,

    2017

  Marketable equity at cost $1,714  $1,714 
  Unrealized gain on marketable equity securities 266     929 
  Marketable equity securities at fair value $1,980  $2,643 
Changes in Marketable Equity Securities
(in thousands) Three months ended
June 30,		 Six months ended
June 30,
  2018 2017 2018 2017
Cost of marketable equity securities sold $   -    $   -    $   -    $   38 
Realized gain on marketable equity securities sold -    -    -    221 
Proceeds from the sale of marketable equity securities sold -    -    -    (259)
Purchase of marketable equity securities -    -    -    477 
Gross unrealized (loss) gain recorded in the statement of operations (222) 333  (663) 461 
Change in marketable equity securities at fair value $(222)    $ 333  $(663)    $ 679