Siman 6
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א על כמה דנין. ובו סעיף אחד: אין הדיינים יושבים לדון בדין פחות משוה פרוטה ואם הוזקקו לשוה פרוטה גומרים דינם אפי' לפחות משוה פרוטה:
1 The Judges do not hold a judicial session [on account of a claim] less than a Perutah's worth. However, if they met [on account of a claim of] a Perutah's worth, they may conclude their trial even for [a claim] less than a Perutah's worth.