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Note 30 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2019
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, 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
  
Charges to costs and expenses    
859
      
94
      
333
      
131
  
Deductions: write-off and others    
(435
 )    
(9
 )    
(223
 )    
(308
 )
Balance as of December 31, 2019    
14,977
      
1,490
      
1,085
      
370