The phrase "small percent" is correct and usable in written English.
You can use it in the same way you would use the phrase "small percentage". For example, "Only a small percent of students passed the test."
"The people behind it might be well meaning, but only a very small percent of overseas drivers are bad drivers, just like a small percent of New Zealanders are bad drivers.
"Only a small percent of our fans will ever be here," Jones said.
PEOPLE AND COYOTES A small percent of people don't like coyotes and don't think they should be in the city.
"Only a few companies report this, but they are only a very small percent of the online universe," she said.
This tax would be set as a small percent of a person's state (or federal) tax or adjusted gross income.
Of those, only a small percent are likely to be equipped with technologies that could reduce emissions.
We'll still be delivering them, but they will be slightly slower than before, but only a small percent.
"Only a certain relatively small percent of the labor force has what might be termed desirable, high-paying jobs — maybe 10 or 15 percent.
For instance, an organism can produce vast quantities of eggs of which, possibly by neglect, only a small percent will survive.
In a small percent of populations, the gaps favor immigrants.
We do a small percent of in-house development.
