Note 5 - Other Assets - Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Marketable equity securities	$ 1,649	$ 1,771
Investments in convertible debt	9,063	503
Long-term equity method investments	12,551	11,589
Cost method investments	4,270	3,103
Other items	2,397	1,009
Total	$ 29,930	$ 17,975