Idaho Code § 19-3010

Disobedience to a subpoena, or a refusal to be sworn or to testify as a witness, may be punished by the court or magistrate as a contempt. A witness disobeying a subpoena issued on the part of the defendant, unless he show good cause for his nonattendance, is liable to the defendant in the sum of $100, which may be recovered in a civil action.