Note 8 - Share-Based Compensation (Details) - Shares Authorized, Available for Future Grant and Outstanding Under Each Plan	Jun. 30, 2014	Mar. 31, 2014
Note 8 - Share-Based Compensation (Details) - Shares Authorized, Available for Future Grant and Outstanding Under Each Plan [Line Items]
Authorized (in shares)	2,275,000
Available (in shares)	545,191
Outstanding (in shares)	1,468,166	1,469,306
2005 Plan [Member]
Note 8 - Share-Based Compensation (Details) - Shares Authorized, Available for Future Grant and Outstanding Under Each Plan [Line Items]
Authorized (in shares)	2,075,000
Available (in shares)	424,068
Outstanding (in shares)	1,456,166
2004 Directors Plan [Member]
Note 8 - Share-Based Compensation (Details) - Shares Authorized, Available for Future Grant and Outstanding Under Each Plan [Line Items]
Authorized (in shares)	200,000
Available (in shares)	121,123
Outstanding (in shares)	12,000