Pappy I think what you have there is just Top Sirloin that just happends to be in Iowa!
My butcher has cuts like that everyday and just calls them sirloin. Here is what I find about it.
Top Sirloin
This is a relatively lean cut of steak. Top sirloin differs from sirloin steaks in that the bone and the tenderloin and bottom round muscles have been removed. It is often marinated to tenderize it. It's a good choice for cutting into cubes, and skewering with vegetables for grilling. Kabob!
Don