Investors & landlords

I'm sorry but I do have one more question. I did not have any income in 2016 other than the capital gains on the sale of my stock. The amount was only around $160. Do I still need to file a federal tax return and/or a state return? I assume that my AGI would be $160 since I wouldn't be paying any taxes on the gains. But would I still have to file the federal return to show that I sold stock and would that mean that I would have to file a state return as well?