Before any professional employe having attained a status of permanent tenure is dismissed by the board of school directors, such board of school directors shall furnish such professional employe with a detailed written statement of the charges upon which his or her proposed dismissal is based and shall conduct a hearing. A written notice signed by the president and attested by the secretary of the board of school directors shall be forwarded by registered mail to the professional employe setting forth the time and place when and where such professional employe will be given an opportunity to be heard either in person or by counsel, or both, before the board of school directors and setting forth a detailed statement of the charges. Such hearing shall not be sooner than ten (10) days nor later than fifteen (15) days after such written notice. At such hearing all testimony offered, including that of complainants and their witnesses, as well as that of the accused professional employe and his or her witnesses, shall be recorded by a competent disinterested public stenographer whose services shall be furnished by the school district at its expense. Any such hearing may be postponed, continued or adjourned.