Note 11 - Stockholders' Equity and Stock Plans (Details) - Allocation of Stock-Based Compensation Expense (Before Deferred Income Tax Benefits) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income tax benefits	$ 852	$ 990	$ 577
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income tax benefits	4	16	11
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income tax benefits	$ 848	$ 974	$ 566