Extending visa/moto permit for CA-4
I'm in Nicaragua now and my 3 month CA-4 (Guatemala, El Salvador, Honduras, Nicaragua) visa and moto permit expire on August 8th. I was wondering if there's a way to extend it without having to cross the border to Costa Rica? I injured my neck and probably shouldn't be riding. If I do have to cross, would I be able to come right back to Nicaragua the same day or I have to spent few days in Costa Rica? And finally, what happens if I don't do anything and cross to Costa Rica some 20 days after it expires? I assume I pay some kind of fee, but how much and how is it calculated?