Kaiser Family Foundation is a great source of information about Medicaid. They frequently release data about Arkansas and other states.
Fact sheet about Medicaid coverage in AR
You can find information about other states here.
How Medicaid (or cuts to it) affects special needs children
How Medicaid (or cuts to it) affects Behavioral Health recipients
How would Medicaid cuts affect veterans?
How would Medicaid cuts affect people in nursing homes?
How does Medicaid help Seniors?