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Note 3 - Inventories - Components of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Raw materials $ 408 $ 495
Work in process 2,799 4,032
Finished goods [1] 8,195 6,587
Supplies 168 160
Inventories, net $ 11,570 $ 11,274
[1] Net of reserve for obsolescence of $1,000 and $5,000 at June 30, 2018 and March 31, 2018, respectively.