Receiving a non-compliance letter from Nasdaq is a negative signal to investors, indicating potential issues with the company's ability to maintain its listing standards. This news can lead to a decrease in investor confidence and a potential drop in the stock price in the short term. The importance is high as the company's future on the exchange is at stake, but not at the maximum since there is still an opportunity to regain compliance. The confidence level is not at 100 because the company's ability to submit an acceptable plan and the Nasdaq's response are not yet known.