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NOTES PAYABLE TO BANKS (Tables)
 6 Months Ended
Jun. 30, 2017
NOTES PAYABLE TO BANKS  
Schedule of interest incurred on the credit facility, interest capitalized related to facilities and equipment under construction and the related weighted average interest rates
  Three months ended
June 30		  Six months ended
June 30		 
  2017  2016  2017  2016 
(in thousands except interest rate data)            
Interest incurred $104  $110  $207  $219