Del. Code tit. 26 § 506
If a person subpoenaed to attend before the Commission, any member or examiner thereof, fails to obey the command of such subpoena without reasonable cause, or if a person in attendance before the Commission, any member or examiner thereof, refuses without lawful cause to be examined or to answer a legal or pertinent question, or to produce a book or paper when ordered to do so by the Commission, any member or examiner thereof, the Commission or any member thereof may apply to the Superior Court in and for the county where such hearing or investigation is being held or any Judge thereof in vacation, who shall have the power of the Court for such purpose, for an order returnable in not less than 2 nor more than 10 days, directing such person to show cause before the Court, or any Judge thereof in vacation, why such person should not comply with the subpoena or order of the Commission. Upon the return of such order, the Court or Judge before whom the matter comes on for hearing, shall examine under oath the persons whose testimony may be relevant, and such person shall be given an opportunity to be heard, and if the Court or Judge determines that the person refused without legal excuse to obey the command of such subpoena or to be examined, or to answer a legal or pertinent question, or to produce a book or paper which such person was ordered to produce, the Court or Judge may order such person to comply forthwith with the subpoena or order of the Commission, and any failure to obey such order of the Court or Judge may be punished by the Court or Judge as a contempt of the Superior Court.
26 Del. C. § 506