Note 11 - Stock-Based Compensation (Details) - Activity Under The Equity Incentive Plans (USD $)			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2013 Employee Stock Option [Member]	Sep. 30, 2012 Employee Stock Option [Member]	Sep. 30, 2013 Employee Stock Option [Member]	Sep. 30, 2012 Employee Stock Option [Member]
Note 11 - Stock-Based Compensation (Details) - Activity Under The Equity Incentive Plans [Line Items]
Shares available for grant	844,000	673,000
Number of shares	618,000	885,000
Exercise Price Per Share (in Dollars per share)	$ 6.97	$ 7.76
Restricted stock units granted			(50,000)	(115,500)	(210,585)	(173,000)
Restricted stock units granted			50,000	115,500	210,585	173,000
Restricted stock units released					(74,000)
Restricted stock units cancelled					408,000
Restricted stock units cancelled					(408,000)
Options granted							(50,000)	0	(50,000)	0
Options granted							50,000	0	50,000	0
Options granted (in Dollars per share)									$ 5.72
Options exercised									(22,000)
Options exercised (in Dollars per share)									$ 5.22
Options cancelled									24,000
Options cancelled									(24,000)
Options cancelled (in Dollars per share)									$ 11.25
Shares available for grant	844,000	673,000
Number of shares	618,000	885,000
Exercise Price Per Share (in Dollars per share)	$ 6.97	$ 7.76