NAV April 23~$15.05. I had to adjust Monday's closing NAV down to $15.01, as that is the value reported by Quadravest in their justification for declaring the dividend.
There were a substantial number of shares short as of April 15, over 400,000 of them. which no doubt added to the surge in price the last couple of days. This does not necessarily mean the number of shorts has decreased, however, as there were likely plenty of new ones being added while others were covering.
The premium is likely to remain elevated at least until the ex-dividend date or unless the market begins to pull back. For now, the momentum has been powerful since the crisis in the middle east did not escalate as some feared last week.