Don't worry, I get 0.01 - 0.03 clicks all the time. But I also get 0,80, 0.90, 1.2 clicks so in the end it's OK.
Its somthing Google keeps a closely guarded secret. No one know exactly exactly the share they get from a click. There are many factors that decide how much a click is worth.
Well, I should post a screenshot here showing clicks I got for less than half a cent ! and I'm getting those everyday. (i.e. 5 clicks $0.02) I just can't understand why I kept it on my site LOL