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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Common Stock, No Par Value $ 155,580 $ 155,120
Retained Earnings 74,854 74,055
TOTAL COMMON EQUITY 230,434 229,175
TOTAL PREFERRED STOCK 2,433 2,433
SUBTOTAL LONG-TERM DEBT 149,005 147,852
Add: Premium on Issuance of Long-term Debt 1,314 1,367
Less: Unamortized Debt Expense (3,276) (3,309)
Less: Current Portion of Long-term Debt (6,982) (6,865)
TOTAL LONG-TERM DEBT 140,061 139,045
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 1,118 1,180
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 4,270 4,375
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT 830 830
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 2,243 2,290
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 845 845
First Mortgage Bonds - Series TT [Member]    
SUBTOTAL LONG-TERM DEBT 2,208 2,258
First Mortgage Bonds - Series SS [Member]    
SUBTOTAL LONG-TERM DEBT 23,000 23,000
First Mortgage Bonds - Series RR [Member]    
SUBTOTAL LONG-TERM DEBT 22,500 22,500
First Mortgage Bonds - Series QQ [Member]    
SUBTOTAL LONG-TERM DEBT 9,915 9,915
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 740 740
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 2,057 2,107
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,505 1,505
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,203 1,237
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 1,095 1,095
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 969 988
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 750 750
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 880 880
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 594 610
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 799 813
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 2,231 2,296
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 3,495 3,495
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 636 636
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 471 482
First Mortgage Bonds - Series AA [Member]    
SUBTOTAL LONG-TERM DEBT 300 300
First Mortgage Bonds - Series Z [Member]    
SUBTOTAL LONG-TERM DEBT 221 224
First Mortgage Bonds - Series Y [Member]    
SUBTOTAL LONG-TERM DEBT 61 61
First Mortgage Bonds - Series X [Member]    
SUBTOTAL LONG-TERM DEBT 54 55
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 1,090 1,090
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 9,717 9,827
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 2,075 2,075
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 2,959 3,021
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 6,068 6,197
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 935 962
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 3,866 3,953
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 256 256
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 84 84
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 162 162
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 124 128
State Revolving Trust Note, due January 25, 2027 [Member]    
SUBTOTAL LONG-TERM DEBT 408 427
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 553 553
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 1,851 1,851
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 372 392
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 3,757 3,827
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 279 279
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,477 3,547
Construction Loans [Member]    
SUBTOTAL LONG-TERM DEBT 6,167 3,874
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 3,606 3,646
First Mortgage Bonds - Series XX [Member]    
SUBTOTAL LONG-TERM DEBT 11,259 11,259
First Mortgage Bonds - Series YY [Member]    
SUBTOTAL LONG-TERM DEBT 3,860 3,860
Convertible Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 1,005 1,005
Convertible Preferred Stock $8.00 Series [Member]    
TOTAL PREFERRED STOCK 350 350
Nonredeemable Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 78 78
Nonredeemable Preferred Stock $4.75 Series [Member]    
TOTAL PREFERRED STOCK 1,000 1,000
State Revolving Trust Note, due February 1, 2036 [Member]    
TOTAL PREFERRED STOCK $ 1,090 $ 1,115