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Note 5 - Warranties (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
Description
 
Balance at
Beginning
of Year
 
 
Warranty
Provisions
 
 
Warranty
Claims
 
 
Balance at
End of
Year
 
                                 
Year ended December 31, 2015:
                                
Allowance for product warranties
   $ 285       288       350     $ 223  
                                 
Year ended December 31, 2014:
                                
Allowance for product warranties
   $ 336       297       348     $ 285  
                                 
Year ended December 31, 2013:
                                
Allowance for product warranties
   $ 241       442       347     $ 336