Authorities have charged a Maine man with stealing from the lobster co-op he manages. Robert Thompson, manager of the Spruce Head co-op in South Thomaston, was released on $100,000 surety bail following his arrest this week on felony theft charges. The Knox County Sheriff’s Department says it has been investigating financial concerns at the co-op for months. As part of the investigation, police also went to the 51-year-old Thompson’s St. George home, a bank and a seafood processing company for financial records. Police did not say how much was stolen, but think it is more than $10,000. It will take several days of examining records to figure it out. The sheriff’s office received assistance from the Maine Marine Patrol, U.S. Coast Guard, National Marine Fisheries Service and Internal Revenue Service.