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Note 4 - Warranty and Extended Services Contract (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
December 31,
  
   
201
9
    
201
8
  
Balance at beginning of year
   $
7,827
     $
3,508
  
Add: Accruals for warranties issued during the period
    
6,467
      
12,364
  
Less: Warranty related costs during the period
    
(7,894
)
    
(8,045
)
Balance at end of year
   $
6,400
     $
7,827