About the offer
As per the SEC filing
"" On June 11, 2007, the Company announced its intentions to proceed with a tender offer to acquire 3,000,000 shares, or approximately 66%, of Diedrich Coffee"
The key words to me are (its intentions} - Diedrich is a current customer so maybe they are not ready to make an official offer and they never stated that one was yet made.
It is quite common for companies to be officially quiet if they are in negotiations.
I am a consultant for NNRF, Inc and own personal shares