The Detroit Federation of Teachers (DFT) has told its 3000+ members not to show up for school on Tuesday, extending their sick-out another day.

All but three of Detroit's 97 public schools were closed on Monday after more than 1,500 teachers called out sick in protest, school district spokeswoman Michelle A. Zdrodowski said.

The union which represents many of them, the Detroit Federation of Teachers, told its members they don't expect them to show up for work Tuesday either. (Detroit parents -- the public school system said on its Facebook page that they usually can confirm if school will open between 5 a.m. to 7 a.m.)

Strikes are illegal in Michigan so the teachers use "sick-outs" to make their political points. The teachers had one in January as well, to protest the dilapidated conditions of the school buildings.

This sick-out is a result of the school system's dire financial straits. On Saturday, "DFT Interim President Ivy Bailey on Saturday said that the school system only has enough money to pay its teachers through June 30. Some school employees can elect to have their pay spread out over the entire year rather than the school year, which means that if they don't get paid after June 30, they've already started working for free, DFT argues."

"There's a basic agreement in America: When you put in a day's work, you'll receive a day's pay. DPS [Detroit Public Schools] is breaking that deal," Bailey said.

The teachers will run an ad in the Detroit Free Press today saying "It's the law that when you work, you get paid. Asking teachers to work without pay is un-American."

The average teacher's salary in the school district is $63,716.