Since your population is small, you could do a census, i.e., covering all population members. You might refer to Draugalis and Plaza (2009) for further insights. Here is the full citation.
Draugalis, J. R., & Plaza, C. M. (2009). Best practices for survey research reports revisited: Implications of target population, probability sampling, and response rate. American Journal of Pharmaceutical Education, 73(8), 142. https://doi.org/10.5688/aj7308142