Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balances (in shares) at Mar. 31, 2012	5,440,968
Balances at Mar. 31, 2012	$ 109	$ 28,324	$ (13,194)	$ 15,239
Issuances of common stock for Director Stock Grants (in shares)	13,000
Issuances of common stock for Director Stock Grants		74		$ 74
Issuance of common stock for exercise of stock options for cash (in shares)	9,970			9,970
Issuance of common stock for exercise of stock options for cash		23		$ 23
Compensation expense related to stock options		$ 656		656
Net income (loss)			$ 4,164	4,164
Balances (in shares) at Mar. 31, 2013	5,463,938
Balances at Mar. 31, 2013	$ 109	$ 29,077	$ (9,030)	20,156
Issuances of common stock for Director Stock Grants (in shares)	9,000
Issuances of common stock for Director Stock Grants	$ 1	50		$ 51
Issuance of common stock for exercise of stock options for cash (in shares)	15,100			15,100
Issuance of common stock for exercise of stock options for cash		36		$ 36
Compensation expense related to stock options		$ 728		728
Net income (loss)			$ (420)	(420)
Balances (in shares) at Mar. 31, 2014	5,488,038
Balances at Mar. 31, 2014	$ 110	$ 29,891	$ (9,450)	20,551
Issuances of common stock for Director Stock Grants (in shares)	16,561
Issuances of common stock for Director Stock Grants		78		$ 78
Issuance of common stock for exercise of stock options for cash (in shares)	60,200			60,200
Issuance of common stock for exercise of stock options for cash	$ 1	214		$ 215
Compensation expense related to stock options		$ 663		663
Net income (loss)			$ (24)	(24)
Balances (in shares) at Mar. 31, 2015	5,564,799
Balances at Mar. 31, 2015	$ 111	$ 30,846	$ (9,474)	$ 21,483