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Note 7 - Goodwill (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Total
 
Balance at December 31, 2016
  $
55,508
 
Acquisition Activity
   
2,200
 
Balance at December 31, 2017
   
57,708
 
Balance at December 31, 2018
  $
57,708