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Note 2 - Acquisitions (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
   
As of
 
Details of Acquisition (in thousands)
 
January 2, 2019
 
Assets acquired
       
Accounts receivable, net
  $
461
 
Inventories
   
586
 
Property and equipment
   
4,138
 
Goodwill
   
906
 
Intangible assets
   
5,599
 
Total assets acquired
  $
11,690
 
Total liabilities assumed
  $
(690
)
Cash paid
  $
11,000