Jackie,
When you go into HyVee, there should be a rack somewhere near the front with the biweekly sales flyer (it looks like a book). Usually there's a blurb on the back that says the days that they're supposed to double and if it's there, it'll be in the tiniest print they can possibly fit in the margin.
I'll call our manager here & see what he says. Each store is individually owned though, so it may be that there is no general policy on coupons that they have to follow. But, as soon as I have an answer, I'll post it here.
Kat
__________________
Click here to shop for deals at coupons.com now!