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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Common Stock, No Par Value $ 150,251 $ 148,668
Retained Earnings 54,628 48,623
TOTAL COMMON EQUITY 204,879 197,291
TOTAL PREFERRED STOCK 2,436 2,436
SUBTOTAL LONG-TERM DEBT 139,205 140,029
Add: Premium on Issuance of Long-term Debt 1,760 1,920
Less: Current Portion of Long-term Debt (5,725) (5,910)
TOTAL LONG-TERM DEBT 135,240 136,039
Convertible Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 1,007 1,007
Convertible Preferred Stock $8.00 Series [Member]    
TOTAL PREFERRED STOCK 349 349
Nonredeemable Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 80 80
Nonredeemable Preferred Stock $4.75 Series [Member]    
TOTAL PREFERRED STOCK 1,000 1,000
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 1,680 1,825
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 5,320 5,635
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 4,177 4,387
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 4,457 4,667
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 399 421
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 2,366 2,463
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 469 506
State Revolving Trust Note, due January 25, 2027 [Member]    
SUBTOTAL LONG-TERM DEBT 501 536
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 674 697
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 254 299
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 203 241
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 304 313
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 101 104
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 1,066 1,115
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 4,738 4,999
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,583 3,771
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 7,350 7,735
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 12,817 8,000
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 2,357 2,411
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 1,246 1,276
First Mortgage Bonds - Series X [Member]    
SUBTOTAL LONG-TERM DEBT 162 215
First Mortgage Bonds - Series Y [Member]    
SUBTOTAL LONG-TERM DEBT 185 245
First Mortgage Bonds - Series Z [Member]    
SUBTOTAL LONG-TERM DEBT 446 559
First Mortgage Bonds - Series AA [Member]    
SUBTOTAL LONG-TERM DEBT 565 700
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 723 845
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 895 1,025
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 3,132 3,550
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 3,690 4,900
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 993 1,083
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 1,300 1,390
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 789 881
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 1,010 1,090
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 1,167 1,255
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 1,365 1,435
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,437 1,537
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,675 1,755
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 2,408 2,559
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 815 850
First Mortgage Bonds - Series QQ [Member]    
SUBTOTAL LONG-TERM DEBT 9,915 9,915
First Mortgage Bonds - Series RR [Member]    
SUBTOTAL LONG-TERM DEBT 22,500 22,500
First Mortgage Bonds - Series SS [Member]    
SUBTOTAL LONG-TERM DEBT 23,000 23,000
First Mortgage Bonds - Series TT [Member]    
SUBTOTAL LONG-TERM DEBT 2,559 2,709
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 935 975
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 2,577 2,720
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT $ 900 $ 935