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Note 5 - Warranty and Service Contracts (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Balance at beginning of year
   $
2,461
     $
1,819
  
Add: Accruals for warranties issued during the year
    
7,583
      
5,375
  
Less: Settlements and expirations during the year
    
(6,536
)
    
(4,733
)
Balance at end of year
   $
3,508
     $
2,461
  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Balance at beginning of year
   $
9,431
     $
10,469
  
Add: Payments received
    
14,369
      
12,344
  
Less: Revenue recognized
    
(13,081
)
    
(13,382
)
Balance at end of year
   $
10,719
     $
9,431
  
 
 
Costs incurred under service contracts in 201
7, 2016 and 2015 amounted to $6.0 million, $6.7 million, and $6.2 million, respectively, and are recognized as incurred.