Any person required under the provisions of the Nebraska Revenue Act of 1967 to pay any income tax or estimated tax, or required by the provisions of such act to make a return, other than a return of estimated tax, keep any records, or supply any information, who willfully fails to pay such tax or estimated tax, make such return, keep such records, or supply such information, at the time or times required by law, shall, in addition to other penalties provided by law, be guilty of a Class II misdemeanor.