I've heard of some cases in the Spanish board regarding lawsuits and bitcoin, but, digging for some information, the most famous cases are the ones the press has shared. For instance:
https://www.coindesk.com/bitcoin-in-the-docks-7-crypto-court-cases/
Anyway, with time, more legal precedents will be settled to lawyers to know what to do (this is quite outdated): https://news.bitcoin.com/get-ready-for-2017-these-legal-precedents-on-bitcoin-were-set-in-2016/

Regarding "small cases" I'm afraid there is not much information yet.
In the forum there are some cases, maybe you find this interesting to read: https://bitcointalk.org/index.php?topic=82969.0