This flag is very uncreative, and therefore too complicated to be an operative flag. It's a blue background with state seal and state name — by the way, have you ever noticed "State of Idaho" is written twice? There are too many details (a tied horse, have you saw?), and too square to American standards.
So, I've came with my own proposal:
[My design proposal]
The charge of the flag is an elk, a symbolic animal of state, present in the seal (inspiration comes from there). The original background was brown, but I decided to put it dark red, the color of the star garnet, a gem only found in Idaho and India, and consequently referential to state nickname, "The Gemstone State".