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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) (Parentheticals) - $ / shares
shares in Thousands
Jun. 30, 2026
Dec. 31, 2025
Common stock, authorized (in shares) 40,000 40,000
Common stock, issued (in shares) 18,843 18,521
Common stock outstanding (in shares) 18,843 18,521
Cumulative preferred stock, shares authorized (in shares) 120 120
Cumulative preferred stock, nonredeemable shares issued (in shares) 13 13
Cumulative preferred stock, nonredeemable shares outstanding (in shares) 13 13
Cumulative preferred stock, price (in dollars per share) $ 7.00  
First Mortgage Bonds | Minimum    
Interest rate 0.00%  
First Mortgage Bonds | Maximum    
Interest rate 5.99%  
Amortizing Secured Notes | Minimum    
Interest rate 3.94%  
Amortizing Secured Notes | Maximum    
Interest rate 7.05%  
State Revolving Trust Notes | Minimum    
Interest rate 0.00%  
State Revolving Trust Notes | Maximum    
Interest rate 4.03%  
Convertible Preferred Stock $7.00 Series    
Cumulative preferred stock, nonredeemable shares issued (in shares) 2 2
Cumulative preferred stock, nonredeemable shares outstanding (in shares) 2 2
Cumulative preferred stock, price (in dollars per share) $ 7.00 $ 7.00
Nonredeemable Preferred Stock $7.00 Series    
Cumulative preferred stock, nonredeemable shares issued (in shares) 1 1
Cumulative preferred stock, nonredeemable shares outstanding (in shares) 1 1
Cumulative preferred stock, price (in dollars per share) $ 7.00 $ 7.00
Nonredeemable Preferred Stock $4.75 Series    
Cumulative preferred stock, nonredeemable shares issued (in shares) 10 10
Cumulative preferred stock, nonredeemable shares outstanding (in shares) 10 10
Cumulative preferred stock, price (in dollars per share) $ 4.75 $ 4.75