What do you think about" It's the least I can do.

這點小事不算什麼。

Is it too weird for you when someone said this one to you?

If my friend visit to Taiwan, I help the friend to pay the money for street food. Also, the friend has helped me a lot online in improving English. 

Could I say" Oh, you helped me a lot. It's the least I can do.

Does it work for you when I use this one?