For decades, these maple syrup producers have left their network of sap-collecting tubes up year-round on the six acres state land where they have a permit to harvest sap. Now, state officials want them to take it down at the end of every harvest season or pay 10 times more to leave it up. Who's in the right? Amid an ongoing dispute with the Minnesota Department of Natural Resources over access to public land to tap maple trees, Mark and Melinda Spinler, worry they may have produced their last b