Section 20. The Authority shall keep an accurate account of all its activities and of all its receipts and expenditures and shall annually make a report thereof as of the end of its fiscal year to its members, to the governor and to the state auditor, such reports to be in a form prescribed by the members, with the written approval of said auditor. The members or said auditor may investigate the affairs of the Authority, may severally examine the properties and records of the Authority, and may prescribe methods of accounting and the rendering of periodical reports in relation to projects undertaken by the Authority. The Authority shall be subject to audit by the state auditor, in accordance with generally accepted government auditing standards, once every 3 years and as often as the state auditor determines is necessary.