probably not.. but its all based on how it went down, I wouldn't think you would get jail time but a lot of court fees and probation and community service and some theft classes... breaking the law isn't worth it in the end. If you did get jail time it wouldn't be more than a month.
You should not expect jail time if you have been caught shoplifting in NE. This is because you have no previous criminal record, hence you will simply be given a warning. However, you will be expected to pay a fine of up to $500 and court costs if you are found guilty. Consult a lawyer for more help. Find out more from http://www.cab.org.nz/vat/gl/le/Pages/Shoplifting.aspx.