The total amount of tax credit evidenced by certificates of tax credit issued to or owned, directly or indirectly, by a single taxpayer authorized by the department who has invested in a Missouri small business shall be not less than one thousand five hundred dollars nor more than an aggregate of one hundred thousand dollars in any one business, except that this section shall not be interpreted to limit other investment. These limits shall not apply to investments in community banks or community development corporations or to investments in Missouri small businesses in distressed communities, as defined in section 135.530.