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Note 8 - Balance Sheet Details (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

June 30,
2019

   

December 31,

2018

 
                 

Raw material

  $ 340,716     $ 348,980  

Work-in-process

    7,453       6,971  

Finished goods

    222,158       188,799  

Total

  $ 570,327     $ 544,750  
Property, Plant and Equipment [Table Text Block]
   

June 30,
2019

   

December 31,

2018

 
                 

Land and improvements

  $ 17,941     $ 15,975  

Buildings and improvements

    174,901       163,161  

Machinery and equipment

    109,537       103,726  

Dies and tools

    20,135       28,198  

Vehicles

    3,321       2,070  

Office equipment and systems

    89,007       82,638  

Leasehold improvements

    3,809       2,137  

Construction in progress

    28,339       26,543  

Gross property and equipment

    446,990       424,448  

Accumulated depreciation

    (146,195 )     (145,519 )

Total

  $ 300,795     $ 278,929