On or before the 10th [tenth] day of each month there may be published in a legal newspaper published in the county where such board or commission is situated, by the council, commission or trustees of every city, town or village in this state, and by every board of education in this state, a summary of expenditures made during the preceding calendar month, which shall include a list of the total expenditures during the month and the amount spent in connection with each budgetary item and a summary of all receipts; provided, however, that the publication herein mentioned shall be made only at the discretion of the council, commission or trustee of every city, town or village, and board of education in this state if they shall deem the said publication necessary in the public interest.