Carlsville Company, which began operations in 2015, invests its idle cash in trading securities. The following transactions are from its short-term investments in trading securities. Prepare journal entries to record these short-term investment activities for the years shown. On December 31 of each year, prepare the adjusting entry to record any necessary fair value adjustment for the portfolio of trading securities. (If no entry is required select No journal entry required in the first entry field. Do not round your intermediate calculations.)