Note 5 - Other Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Dec. 12, 2014
ATEC [Member]
Equity Method Investment, Ownership Percentage				24.30%
Equity Method Investments				$ 5,900
Income (Loss) from Equity Method Investments	$ (9)	$ (140)
Equity Method Investment, Aggregate Cost				$ 14
Other than Temporary Impairment Losses, Investments	454	1,900
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	(82)	7
Equity Method Investments	10,977	11,041
Income (Loss) from Equity Method Investments	(120)	$ (7)	$ 303
Available-for-sale Securities, Gross Realized Gain (Loss)	$ (1)