Kleinblatt is closed on those holidays (2019):

   1st of January New year
20th of April till 27th of April Pessah (jewish easter)
   9th of June and the 10 of June  Shavouoth (jewish pentecost)
   3rd of August till 25th of August yearly holidays
   3th of  September till 1st October Rosh hashana (jewish newyear)
   9th of  October Yom kippoer (day of reconciliation)
14th of October till 15th of October Soekoth (feast of tabernacles)
21st of October till 22nd October Simchat torah (feast of the bible)