CREATE TABLE table_203_531 (id DECIMAL, "date" TEXT, "tournament" TEXT, "location" TEXT, "winner" TEXT, "score" TEXT, "1st prize  ( $ ) " DECIMAL)

which pga tour event gave out the least prize money to its 1st place finisher ?
SELECT "tournament" FROM table_203_531 ORDER BY "1st prize ($)" LIMIT 1
SELECT "tournament" FROM "table_203_531" ORDER BY "1st prize ($)" NULLS FIRST LIMIT 1