Ames National Corp. directors have approved a plan to buy up to 100,000 shares, or about 1 percent, of the bank holding company’s outstanding common stock in the next 12 months. The buyback will be made in open-market transactions at the discretion of management using company cash, Ames National said in a news release. As of March 31, Ames National reported assets more than $1 billion and deposits of about $780 million. The company’s affiliated banks are First National Bank of Ames, Boone Bank & Trust Co. in Boone, State Bank & Trust Co. in Nevada, Randall-Story State Bank in Story City and United Bank & Trust in Marshalltown.