Note 6 - Other Assets - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Marketable equity securities	$ 1,785	$ 1,737
Auction rate preferred securities	350	350
Long-term equity investments	10,854	11,041
Other items	727	576
Total	$ 13,716	$ 13,704