BALANCE SHEETS (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Nuclear fuel; fuel in process	$ 48,492	$ 56,129
Allowance for doubtful accounts receivable, current	$ 2,261	$ 2,906
Common stock, par or stated value per share	$ 1	$ 1
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	65,639,091	65,520,551
Common stock, restricted shares	120,534	84,446
Treasury stock, shares	25,492,919	25,492,919