Generally speaking, the content of the Thai Court’s judgement is not short.
The part that summarizes the facts of the Plaintiff and the Defendant is given in detail, but the part that analyzes the facts may be not very long, because Thai law is under the Civil Law or the Code Law system. Thus, the relevant law is recorded in writing as the Code Law already. Consequently, the judge need not explain in too much detail, as the applicable law is already fixed.
However for Common Law, the judge must provide reasoning for the judgement, because most such laws are not fixed in writing. The judge has to apply the doctrine given in other cases, or cite reference text books of legal authorities. Therefore, the written judgement in Common Law, especially in the analysis part, is usually quite long.