If you itemized your deductions for 2017, its possible that the state refund would be considered taxable income on your 2018 return. If you didn't itemize, then you don't need to worry about the 1099g.
$18 in interest is hardly worth filing an amended return for, it couldn't possibly make more than a few dollars difference in a refund.
♪♫•*¨*•.¸¸♥Lisa♥ ¸¸.•*¨*•♫♪
