A teacher employed by the Division shall be paid $50.00, once only for each three (3) unit professional course taken after permanent certification and after coming on staff, where in the opinion of the Board the course is of specific benefit to the Division's educational program. These courses must have prior approval of the Superintendent. This allowance will be paid for each course approved hereunder upon filing with the Secretary-Treasurer of the Division satisfactory evidence of the completion of the course. This allowance shall be repayable unless the teacher remains on staff the following year.