American Idols Only Making $1K Each Per Show on Summer Tour

TMZ obtained a copy of the contract all Idol finalists had to sign before the show -- which spells out exactly how much dough they'll pull in if they're invited to participate on the international tour.

In addition to the $1,000-per-concert -- the documents show each finalist will share in merchandise profits from the tour ... and will also receive $50 in spending cash for non-concert days.