On January 1, 2015, total assets for Wininger Technologies were $135,000; on December 31, 2015, total assets were $155,000. On January 1, 2015, total liabilities were $110,000; on December 31, 2015, total liabilities were $115,000. What is the amount of the change and the direction of the change in Wininger Technologies' stockholders' equity for 2015?