Idaho Code § 58-322: Rebates of erroneous payments of principal or interest.

In all cases of payments of principal or of interest to the state on such certificates of sale, where more than the amount due has been, since January 1, 1917, or hereafter shall be, paid by error or mistake, the amount of such overpayment shall be repaid on demand, to the person holding the certificate, as shown of record at the time the demand for repayment is made.