Copy Tables from PDF into Spreadsheet

I have pdf-documents with tables, roughly twenty pages. Each table (spanning two pages each) contains about 36 columns and 52 rows of data, not including headers etc. These tables are scanned and stored in the pdf as images, i.e. we cannot copy them easily out of the pdf into Excel unless we type them in manually. We need these tables to be in a spreadsheet-format such as an Excel file, so that the data can used for further analysis. The task thus involves either typing in the data manually into Excel, or finding / using alternative software to make this happen, if such exists. This is up to you. For us it counts that we have e.g. an Excel or OpenOffice file with the correct data. Note that if this task is completed and we are satisfied, it is very likely that there will be similar follow-up tasks at some point.