Return Number Greater Than Zero

With four numbers, I am attempting to "return" a number that is greater than zero, EVEN IF zero is in the array. Meaning, I need the number greater zero, knowing zero is within the array. This will be a part of a much longer concatenate formula.

010 5 0

I would expect the answer to be "5".
I tried: =abs(min(A1:D1))

This works great if there is a negative number (e.g. a -5, rather than 5 shown above), but when the numbers are all positive, the result is "0", I want 5 or the next greater number above zero.