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Note 4 - Warranty and Extended Services Contracts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
December 31,
  
   
201
8
    
201
7
  
Balance at beginning of year
   $
3,508
     $
2,461
  
Add: Accruals for warranties issued during the period
    
9,205
      
7,583
  
Less: Warranty related expenses during the period
    
(8,045
 )    
(6,536
 )
Balance at end of year
   $
4,668
     $
3,508