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Note 2 - Inventories, Net - Components of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Raw materials $ 410 $ 347
Work in process 2,602 2,036
Finished goods(1) [1] 5,878 5,460
Supplies 144 129
Inventories, net $ 9,034 $ 7,972
[1] Net of reserve for obsolescence of $5,000 and $3,000 at March 31, 2018 and 2017, respectively.