When a person is incarcerated in prison after conviction, there is an automatic system which generates periods at which point the person becomes eligible for parole. That person will then have a hearing before the Parole Board, which may then release that person. If a person is denied, they have the right to immediately apply for reconsideration.
If a person is revoked from their parole, they will be sent back to prison for a period of time. Typically, that time is from 0 to 12 months. For more information, you should refer to the Arkansas Parole Board website.