Note 15 - Employee and Non-Employee Stock Options - Summary of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Outstanding (in shares)	46,000	101,500
Outstanding (in dollars per share)	$ 8.68	$ 8.73
Outstanding (Year)	2 years 32 days	2 years 317 days	3 years 142 days
Outstanding	$ 617,000	$ 732,000	$ 342,000
Exercised (in shares)		(17,500)
Exercised (in dollars per share)		$ 8.61
Forfeited (in shares)	(6,000)	(6,000)
Forfeited (in dollars per share)	$ 8.29	$ 8.29
Repurchased (in shares)		(32,000)
Repurchased (in dollars per share)		$ 8.96
Outstanding (in shares)	40,000	46,000	101,500
Outstanding (in dollars per share)	$ 8.74	$ 8.68	$ 8.73
Exercisable (in shares)	40,000
Exercisable (in dollars per share)	$ 8.74
Exercisable (Year)	2 years 32 days
Exercisable	$ 617,000