  In this article, we study skew cyclic codes over ring
$R=\mathbb{F}_{q}+v\mathbb{F}_{q}+v^{2}\mathbb{F}_{q}$, where $q=p^{m}$, $p$ is
an odd prime and $v^{3}=v$. We describe generator polynomials of skew cyclic
codes over this ring and investigate the structural properties of skew cyclic
codes over $R$ by a decomposition theorem. We also describe the generator
polynomials of the duals of skew cyclic codes. Moreover, the idempotent
generators of skew cyclic codes over $\mathbb{F}_{q}$ and $R$ are considered.
