Tell TurboTax that you will withdraw those few dollars and run the balance down to zero. This will generate the excess processing and the penalty calculation (remember: 6% of the smaller of the excess or your balance on 12/31/2017).
Then next year, you should get a 1099-SA for the earnings which you will have to report as income. After tax year 2018, though, you can stop answering any questions about an HSA, since you won't have HDHP coverage and you won't have an HSA, either.
