Note 9 - Stock-Based Awards (Details) - Stock-based Compensation Expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 694		$ 1,469
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	54		89
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	577	[1]	1,329	[1]
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 63		$ 51

[1] Reflects reversal of stock-based compensation expense of $289 thousand in fiscal 2014 for the cancellation of unvested stock options granted to our former President and Chief Executive Officer, Cynthia F. Ansari.