The integer group determinants for $GA(1,q)$

We show that the integer group determinants for the general affine group of degree one, $GA(1,q)$ with $q=p^k$ a prime power, take the form $D=A{B}^{q-1},$ where $A$ is a ${\mathbb{Z}}_{q-1}$ integer group determinant and $B\equiv Aq$. This generalizes the result for $k=1$. When $2^k-1$ is a Mersenne prime we show that this condition is both necessary and sufficient for $GA(1,2^k)\mathrm{.}$ The same is true for $GA(1,9)$ and $GA(1,27)$.