Note 11 - Stockholders' Equity and Stock Plans (Details) - Change in Restricted Stock Granted Under the 1994 Stock Incentive Plan (Restricted Stock [Member], USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Restricted Stock [Member]
Note 11 - Stockholders' Equity and Stock Plans (Details) - Change in Restricted Stock Granted Under the 1994 Stock Incentive Plan [Line Items]
Beginning Balance	5,625	7,500	7,967
Beginning Balance	$ 12.58	$ 12.58	$ 12.74
Vested	(1,875)	(1,875)	(467)
Vested	$ 12.58	$ 12.58	$ 15.31
Ending Balance	3,750	5,625	7,500
Ending Balance	$ 12.58	$ 12.58	$ 12.58