Czech Post is the courier handling this parcel at the destination end. The parcel has arrived in the destination country and is held at the post office of exchange, the facility where international mail is handed over between countries. "Detained" here means the parcel is being held while it goes through checks there. It does not by itself mean something is wrong.
This message by itself is normal. It usually appears right after the parcel is accepted at the exchange office. Most often the next step is that the parcel is classified in a logistics centre. If the hold lasts longer than the previous steps, customs checks may be the cause, but the message does not say so.
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Czech Post — is not the only postal service that you can track at PackageRadar. See full list of postal services available.