Part of the problem is that 1) many of the brokerages won't accept a transfer of OTC stocks. They'll let you buy OTC shares in their brokerage, but they won't let you transfer them in (having purchased them elsewhere)... Charles Schwab being one of them. Then the second problem is, many of those living in Europe can't open a brokerage account in the U.S. without a U.S. address and a tax ID number.
This problem will be fixed when Northwest gets off the OTC and onto one of the larger ones. But it's currently not a great place to find oneself, unable to buy and only to sell, perhaps on the cusp of a nice swing back up.