Ala. Code § 33-13-12
The authority shall pay out of the proceeds from the sale of any of the bonds (other than refunding bonds) those expenses which the board of directors may deem necessary or advantageous in connection with the sale or issuance thereof. The proceeds from the sale of all bonds, other than refunding bonds, remaining after paying the expenses of their sale and issuance shall be turned in to the treasury of the State Docks Department, shall be carried in a special fund therein and shall be subject to be drawn on by the State Docks Department, upon the approval of the authority, but solely for the respective purposes for which they were authorized to be issued, viz., payment of costs incurred in the development, construction, improvement, expansion and modernization (or any of them) of the state docks facilities at the Port of Mobile, as the state facilities may from time to time exist. The proceeds from the sale of any refunding bonds shall be paid into the State Treasury, shall be carried in a special fund therein and shall be subject to withdrawal by the authority for the purpose of refunding the principal of the outstanding bonds for the refunding of which they were authorized to be issued. The expenses incurred in issuing any such refunding bonds shall be paid out of the State Treasury upon approval by the authority.
Any portion of the proceeds derived from the sale of any of the bonds which the State Docks Director may determine is not then needed for any of the purposes for which the bonds are authorized to be issued shall, on order of the State Docks Director, be invested in time deposits in banks in Alabama qualified and designated as state depositories or in any securities that are direct general obligations of the United States or the principal of and interest on which are unconditionally and irrevocably guaranteed by the United States. Any such securities may, at any time and from time to time, on order of the State Docks Director, be sold or otherwise converted into cash. The income derived from any such investments shall be added to and treated as a part of the proceeds so invested.
Ala. Code § 33-13-12 (1975)