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Note 29 - Valuation Accounts (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block]
    Allowance for
deferred tax
assets
  Allowance for
doubtful
accounts
  Slow-moving
inventory
  Warranty
reserve
                 
Balance as of December 31, 2015    
19,212
     
1,091
     
728
     
576
 
Charges to costs and expenses    
238
     
103
     
121
     
319
 
Deductions: write-off and others      
 
     
(233
)    
(46
)    
(347
)
Balance as of December 31, 2016    
19,450
     
960
     
803
     
548
 
Charges to costs and expenses    
1,536
     
69
     
239
     
316
 
Deductions: write-off and others      
(6,720
)    
     
(319
)    
(415
)
Balance as of December 31, 2017    
14,266
     
1,029
     
723
     
449
 
Charges to costs and expenses    
515
     
365
     
355
     
433
 
Deductions: write-off and others      
(228
)    
10
     
(104
)    
(334
)
Balance as of December 31, 2018    
14,553
     
1,404
     
974
     
548