Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Documents (template_id VARCHAR)
TABLE: CREATE TABLE Templates (template_id VARCHAR)

### Question ###
Show ids for all templates not used by any document.

### Accurate SQL ###

SELECT template_id FROM Templates EXCEPT SELECT template_id FROM Documents