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DEBT (Tables)
 12 Months Ended
Dec. 31, 2017
DEBT [Abstract]  
Schedule of Long-term debt
Long-term debt consists of:

 
 
December 31,
 
In thousands
 
2017
  
2016
 
First mortgage bonds
      
 
      
Series O, 8.17%, due December 29, 2020
 
$
-
  
$
20,000
 
Series P, 6.58%, due January 31, 2018
  
25,000
   
25,000
 
Series Q, 4.75%, due December 1, 2043
  
-
   
15,400
 
Series R, 5.96%, due December 31, 2028
  
25,000
   
25,000
 
Series S, 4.45%, due December 31, 2033
  
9,600
   
10,200
 
Series T, 4.24%, due December 20, 2036
  
40,000
   
-
 
 
  
99,600
   
95,600
 
 
        
State revolving fund loans
        
 
        
4.48%, due August 1, 2021
  
1,190
   
1,456
 
3.57%, due September 1, 2023
  
558
   
640
 
3.64%, due May 1, 2025
  
1,025
   
1,142
 
3.41%, due February 1, 2031
  
2,315
   
2,448
 
3.40%, due July 1, 2032
  
2,243
   
2,361
 
 
  
7,331
   
8,047
 
 
        
Sub-total
  
106,931
   
103,647
 
 
        
Less: current maturities (principal amount)
  
1,344
   
1,316
 
 
        
Total long-term debt
 
$
105,587
  
$
102,331
 
Future Minimum Payments
Payments of principal amounts due during the next five years and thereafter:
 
In thousands
 
2018
  
2019
  
2020
  
2021
  
2022
  
Thereafter
 
First Mortgage bonds
 
$
600
  
$
600
  
$
600
  
$
600
  
$
600
  
$
96,600
 
State revolving fund loans
  
744
   
771
   
801
   
832
   
533
   
3,651
 
Total payments
 
$
1,344
  
$
1,371
  
$
1,401
  
$
1,432
  
$
1,133
  
$
100,251