Do I need to file an estate return

[gaunspach]

When my mother passed away, she owned some mature series EE saving bonds.  All interest had accrued before she passed.   I cashed the bonds into an estate account.  I claimed the interest on her final personal return.  I filed a 1099-INT nominee from the estate to my mother.  Besides the savings bond interest, there is only 15 dollars of income in her estate.  Do I still need to file a federal estate return 1041?

[gaunspach]

Thank you