Any public official or officials who shall audit, allow or pay out, or cause to be paid out, any funds of any county for any article, public improvement, material, service or labor, contrary to the provisions of section 23-336, shall be liable for the full amount so expended, and the same may be recovered from any such official or the surety upon his official bond by any such county, or any taxpayer thereof.
Neb. Rev. Stat. §§ 23-337