BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Nuclear fuel; fuel in process	$ 51,854	$ 46,996
Allowance for Doubtful Accounts Receivable, Current	$ 2,046	$ 2,253
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares Issued	65,709,819	65,725,246
Common Stock, Restricted Shares	118,834	124,297
Treasury Stock, Shares	25,384,834	25,492,919