Do I file New Hampshire tax return?

I work full time in MA and live in NH.  I recently started an Ecommerce business out of my NH home.  According to Turbo Tax my Gross Income from the business was $15,600.  I think I read that I don't need to file a NH return if the Gross Income was under $50, 000.  I have never had to file a NH return before.  Can I delete my NH return that I started and not file a NH return?