Most organic eggs are from chickens in concentrate animal feed operations, (CAFO's) and just eat grain. If the yolk is that yellow, I would definitely say they are indoor only grain fed chickens. My local co-op carries "cage free" eggs, which just means that the chickens are not in cages, but are not let outside at all, and the yolks are the same color you describe.
I have bought them in a pinch when I couldn't get pastured eggs, I do think that organic is better than not, but definitely not nearly as good as pastured eggs. I just found that our little tiny gas station/deli down the road from out house started carrying pastured eggs, and I was happy to see that they were "only" $2.99 a dozen. I was paying $2.50 this summer and driving 30 miles each way to get them. They are a nice bright orange so I know the chickens are getting plenty of grass time, which is amazing with a foot of snow on the ground!
Tessa, mama to M (93) B(94) T (05) G (08) and waiting for the arrival of ? on 10/23