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Pledged assets (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Certain Assets Provided as Collateral Mainly for Long-term Bank Loans and Leases
Assets
  
Purpose
   
December 31,
2019
   
December 31,
2020
 
  
Carry
amount
   
Carry
amount
 
       
NT$000
   
NT$000
 
Non-current
financial assets at amortized cost
   
Lease and
bank loan		 
 		   68,450    48,319 
Property, plant and equipment, net
      
- Land
   Bank loan    452,738    452,738 
- Buildings
   Bank loan    4,095,929    4,092,287 
- Machinery and equipment
   Bank loan    4,105,912    6,912,544 
    
 
 
   
 
 
 
    
 
8,723,029
 
  
 
11,505,888