MEMORANDUM

Michael Byce appeals the district court’s November 7, 2012 order awarding, inter alia, $41,250 in money damages to Just-Med, Inc. (the “Damages Award”). We have jurisdiction under 28 U.S.C. § 1291 , and we affirm.

The district court properly determined that JustMed could recover as damages the replacement cost of the computer source code that Byce converted. Byce does not dispute liability, and concedes that he converted all versions of the computer source he had developed for Just-Med. He likewise does not dispute that JustMed spent $41,250 developing new source code to replace the code he converted. Instead, Byce argues that Idaho conversion law, categorically, does not permit a plaintiff to recover the damages at issue — replacement cost of converted source code. We reject this narrow reading of the law. Idaho permits broad recovery of compensatory and punitive damages, see Luzar v. W. Sur. Co., 107 Idaho 693 , 692 P.2d 337, 342-43 (1984), as well as consequential damages that have been proven with reasonable certainty, see Nora v. Safeco Ins. Co., 99 Idaho 60 , 577 P.2d 347, 351 (1978). The damages at issue here are clearly permissible under Luzar and Nora .

The district court did not clearly error by finding that Byce’s conversion caused JustMed to reproduce the code, nor that it cost JustMed $41,250 to do so. See Tonry v. Security Experts, Inc., 20 F.3d 967, 970 (9th Cir.1994) (reviewing the district court’s factual findings, including the calculation of damages, for clear error), abrogated on other grounds by Turner v. Anheuser-Busch, Inc., 7 Cal.4th 1238 , 32 Cal.Rptr.2d 223 , 876 P.2d 1022 (1994). Under Idaho law, damages must be proven with “reasonable certainty.” Griffith v. Clear Lakes Trout Co., Inc., 143 Idaho 733 , 152 P.3d 604, 611 (2007). Here, testimony at trial sufficiently supported the district court’s damages award. See id. (“Reasonable certainty requires neither absolute assurance nor mathematical exactitude; rather, the evidence need only be sufficient to remove the existence of damages from the realm of speculation.”). To the extent that Byce cites alleged inconsistencies in the trial testimony, the district court as trier of fact was tasked with resolving these conflicts. See Anderson v. City of Bessemer City, 470 U.S. 564, 574 , 105 S.Ct. 1504 , 84 L.Ed.2d 518 (1985) (stating that a district court’s factual findings should be upheld if they are “plausible in light of the record viewed in its entirety”).

The district court did not abuse its discretion by issuing the Damages Award as a supplemental order to its August 29, 2007 Memorandum Decision, rather than issuing a new judgment and order. See Jeff D. v. Kempthorne, 365 F.3d 844, 850 (9th Cir.2004) (motion to vacate judgment reviewed for an abuse of discretion). Byce argues that this court’s prior decision in JustMed, Inc. v. Byce, 600 F.3d 1118 (9th Cir.2010), required the district court to vacate its prior judgments in' this matter. The decision, however, did not order that the prior judgments be vacated, see id. at 1131 , and the district court’s decision to supplement its prior order therefore did not violate this court’s mandate. See Herrington v. Cnty. of Sonoma, 12 F.3d 901 , 904 (9th Cir.1993) (stating that “the rule of mandate allows a lower court to decide anything not foreclosed by the mandate”).

Byce argues for the first time on appeal that, because the district court failed to vacate its prior judgments, he “could well be made to pay continuing interest” on the district court’s prior damages award. Because Byce did not properly raise this argument before the district court, and fails to cite a single case supporting his assignment of error, the argument is waived. See O’Rourke v. Seabord Sur. Co. (In re E.R. Fegert, Inc.), 887 F.2d 955, 957 (9th Cir.1989) (stating that an “argument must be raised sufficiently for the trial court to rule on it”); see also Indep. Towers of Wash. v. Washington, 350 F.3d 925 , 930 (9th Cir.2003) (stating that appellant bears the “burden on appeal to present the court with legal arguments to support its claims”).

We deny JustMed’s Motion for Attorney Fees on Frivolous Appeal. See Grimes v. C.I.R., 806 F.2d 1451, 1454 (9th Cir.1986) (noting that “an appeal that lacks merit is not always frivolous”).

AFFIRMED.

This disposition is not appropriate for publication and is not precedent except as provided by 9 th Cir. R. 36-3. . Because we have affirmed the Damages Award under the conversion theory, we need not address the alternative theory of recovery under Idaho fiduciary law.