Beginning with the 1994 tax year, a person qualifying as a rural physician shall be allowed a credit against the tax imposed by Section 40-18-2, in the sum of $5,000. No credit shall be allowed to a rural physician who is, on May 4, 1993, practicing in a small or rural community. No credit shall be allowed to a physician who has previously practiced in a small or rural community unless, after May 4, 1993, that physician returns to practice in a small or rural community after having practiced in a large or urban community for at least three years. The tax credit may be claimed for not more than five consecutive tax years. The Department of Revenue shall promulgate any rules and regulations necessary to implement and administer the provisions of this article.