Upon failure or refusal by any person, who has been convicted in the municipal court and fined by the municipal judge for violation of any ordinance of the city, to pay such fine, the court may order, except in cases of indigency, that the defendant be imprisoned until the fine and costs are fully paid, or if the fine is not paid, then for every ten dollars ($10.00) of such judgment the prisoner shall serve one day in jail or other place of confinement.

(Code 1964, § 7.155)