Those temps look just fine for idle temps. The temps you need to be concerned with are the core temps at 100% load. Stress your system out with Prime95 or LinX and keep a eye on the temps. I also suggest you download Realtemp 3.70 to monitor core temps as it will be more accurate.
I am not sure what is TJmax on those cpu's but you can check in realtemp settings. TJmax for the 3770k cpus are 105c so what that means is the cores wont start to throttle till they hit 105c. So for 24/7 use I would keep core temps to a max of 85c.