Inventories were as follows:
(U.S. Dollars, in thousands)
March 31,
2018
December 31,
2017
Raw materials
$
5,889
6,067
Work-in-process
13,666
12,487
Finished products
58,131
60,441
Deferred cost of sales
—
2,335
Inventories
77,686
81,330