Size of an extreme-value test

Let $X \sim \operatorname{Bin}(3, \theta)$, where $\theta \in (0,1)$ is an unknown parameter. For testing $H_0: \frac{1}{4} \le \theta \le \frac{3}{4}$ against $H_1: \theta < \frac{1}{4}$ or $\theta > \frac{3}{4}$, consider the test $\phi(x) = \begin{cases} 1 & \text{if } x \in \{0, 3\} \ 0 & \text{if } x \in \{1, 2\} \end{cases}$. The size of the test $\phi$ is __________ (rounded off to two decimal places).