Minnesota's method for dividing schools by class size is somehow both interesting and maddening. On one hand, the MSHSL doesn't insist on using the same divisions for all sports regardless of how many schools participate in that sport - for instance, there's only A and AA in hockey (since it's still an expensive sport, even in Minnesota), while in football there 5A, 4A, 3A, 2A, A, and then there's even such a thing as nine-man football for really small schools. The need to have an A on everything is kind of annoying though (I didn't mind attending a Class D school in NY), and when it comes to hockey especially, private schools are really allowed to abuse the difference between A and AA. Most of the private schools are small enough to fit into A, but they practically recruit when it comes to hockey, so they beat up on little schools and then play each other in St. Paul most of the time. Pretty weak. So good on STA for stepping up.
That makes what Roseau does all the more impressive. They would be well within their rights to play in A since they're a small, small town on the extreme northern end of the state, but their hockey pedigree is such that they choose to play with the big schools and more often than not they beat them. That's pretty cool.