Note 11 - Stockholders' Equity and Stock Plans (Details) - Summarized Information about Stock Options Outstanding (USD $)	12 Months Ended				12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2014 $2.62 To $10.97 [Member]	Mar. 31, 2013 $2.62 To $10.97 [Member]	Mar. 31, 2014 $10.98 To $19.36 [Member]	Mar. 31, 2013 $10.98 To $19.36 [Member]	Mar. 31, 2014 $19.37 To $23.27 [Member]	Mar. 31, 2013 $19.37 To $23.27 [Member]	Mar. 31, 2014 $2.62 To $23.27 [Member]	Mar. 31, 2013 $2.62 To $23.27 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices per Common Share - Low					$ 2.62	$ 2.62	$ 10.98	$ 10.98	$ 19.37	$ 19.37	$ 2.62	$ 2.62
Range of Exercise Prices per Common Share - High					$ 10.97	$ 10.97	$ 19.36	$ 19.36	$ 23.27	$ 23.27	$ 23.27	$ 23.27
Options outstanding (in Shares)	1,692,750	1,479,000	1,348,437	1,328,937	1,022,500,000	724,250,000	573,550,000	640,550,000	96,700,000	114,200,000	1,692,750,000	1,479,000,000
Weighted Average Remaining Contractual Life (Years) - Outstanding	6 years 73 days				8 years	6 years 328 days	3 years 146 days	4 years 6 months	3 years 36 days	4 years 73 days	6 years 73 days	5 years 219 days
Weighted Average Exercise Price Per Common Share - Outstanding	$ 10.12	$ 10.80	$ 12.44	$ 12.62	$ 7.38	$ 7.04	$ 13.06	$ 13.11	$ 21.72	$ 21.72	$ 10.12	$ 10.80
Options - Exercisable (in Shares)	945,500				357,750,000	328,937,000	491,050,000	495,800,000	96,700,000	114,200,000	945,500,000	938,937,000
Weighted Average Exercise Price Per Common Share - Exercisable	$ 12.18				$ 8.12	$ 8.57	$ 13.26	$ 13.46	$ 21.72	$ 21.72	$ 12.18	$ 12.75