The commission is authorized to make and change from time to time such rules and regulations as it shall deem necessary to secure the prompt payment of compensation, and after affording the surety opportunity to be heard, may withdraw its approval of any employer or surety who unnecessarily delays payment of compensation, and the commissioner [director] of [the department of] insurance upon notification accordingly shall withdraw his authorization of a surety to insure or guarantee the payment of workmen's compensation liability of employers in this state.
Idaho Code § 72-304