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Marketable Equity Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Marketable Equity Securities and Accumulated OCI
(in thousands)    September 30,     2017  December 31,     2016
  Marketable equity securities at fair value $2,819  $1,339 
  Cost 1,714     274 
  Accumulated other comprehensive income for
    unrealized holding gains		 1,105  1,065 
  Deferred taxes on accumulated other comprehensive
    income for unrealized holding gains		 (368) (353)
Accumulated other comprehensive income $737  $   712 
Changes in Marketable Equity Securities
(in thousands) Three months ended
September 30,		 Nine months ended
September 30,
  2017 2016 2017 2016
Gross cash proceeds $ 407  $  16  $  666  $  56 
Cost 50  6  88  16 
Gross gain on sale included in earnings during the period 357  10  578  40 
Deferred taxes on gross gain on sale included in earnings (132) (4) (214) (15)
Reclassification adjustment to unrealized gain in other
   comprehensive income for net gains included in earnings		 (225) (6) (364) (25)
Gross unrealized holding (loss) gain arising during the period
   included in other comprehensive loss		 157  83  618  753 
Deferred taxes on unrealized holding (loss) gain included in
   other comprehensive loss		 (58) (31) (229) (279)
Net unrealized holding (loss) gain 99  52  389  474 
Other comprehensive income (loss) from marketable equity securities $(126) $46  $25  $449