We have 613 STADLERs that came thru Ellis Island to America.www.ellisislandrecords.org There were some from Detta/Detla. Your ancestor Isidor Stadler was going to an acqu. ?uton Krohn,Pittsburg, Pa. It is possible that your Anna and Rose came thru Baltimore, Boston or Philadelphia.
This site might be of help :www.genealogienetz.de/reg/ESE/dsinfo.htm The LDS-Mormons (Family History Center) website is listing a Roman Catholic church records of Detta. You might want to look into them.
Romania's phone site www.whitepages.robut no listing in Deta,( Timis), but in Lugoj.A listing for BUCHMAN(N)and KROHN in Timisoara's phone book. www.genealogy.ro