@Maxine  From the IA DOR expanded instructions:

Nonresidents of Iowa should file IA return [if > $1,000] and report:

          Wages earned in Iowa

• Income from Iowa property
  • rental income
  • capital gain on the sale of property
• Self employment income earned while working in Iowa
• Iowa unemployment benefits
• Iowa gambling winnings
• Income from pass-through entities, such as partnerships and S-corporations

_________________________________________________________

As you can see, investment income from interest and dividends are not listed.