Neb. Rev. Stat. § 11-117

When the incumbent of an office is reelected or reappointed he shall qualify by taking the oath and giving the bond as above directed, but when such officer has had public funds or property in his control, his bond shall not be approved until he has produced and fully accounted for such funds and property. When it is ascertained that the incumbent of an office holds over by reason of the nonelection or nonappointment of a successor, or of the neglect or refusal of the successor to qualify, he shall qualify anew within ten days from the time at which his successor, if elected, should have qualified.