Idaho Code § 39-1348

When any warrant is presented to the district treasurer for payment, and the same is not paid for want of funds, the treasurer must endorse on the back of said warrant, “not paid for want of funds,” and shall write thereon the day of presentation and sign his name thereto, and warrants so endorsed by the treasurer shall draw interest at a rate established by the board of the hospital district from the date of endorsement until paid.