It seemed kind of a crazy idea at the time: an online-only “newspaper” in a town that already had two full-service ones. But former Star Tribune publisher Kramer and his wife, Laurie, saw an opening in the market when they launched in 2007. Seven years later, they have carved out a sustainable niche and are steadily drawing support from members and foundations. In 2013, MinnPost’s revenue was up 7.3 percent to $1.6 million and the nonprofit has posted a surplus for four consecutive years. With an eye to the future, Kramer replaced himself with Andrew Wallmeyer as publisher earlier this year.