Shareholders' Equity (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Additional disclosures
Stock-based compensation expense	$ 60,353	$ 67,808
Fair value of traded options, vesting restrictions	0.00%
Stock options
Assumptions for employee stock options
Risk-free interest rate, minimum (as a percent)	0.70%	0.90%
Risk-free interest rate, maximum (as a percent)	1.00%	1.30%
Expected life	5 years	5 years
Expected volatility, minimum (as a percent)	99.00%	98.00%
Expected volatility, maximum (as a percent)	103.00%	99.00%
Expected dividend (as a percent)	0.00%	0.00%
Additional disclosures
Fair value of options granted	88,000	183,000
Stock-based compensation expense	60,353	67,808
Stock option activity and related information
Granted (in shares)	87,000	235,000
Plan | Stock options
Shareholders' Equity
Exercisable on each anniversary (as a percent)	20.00%
Vesting period	5 years
Exercisable period	5 years
Number of shares authorized	950,000
Total unrecognized compensation costs related to nonvested stock options	$ 293,000
Expected period for recognition of compensation costs related to nonvested stock options	5 years
Equity compensation plans approved by security holders | Stock options
Stock option activity and related information
Balance at the beginning of the period (in shares)	635,000	585,000
Granted (in shares)	62,000	155,000
Forfeited/expired (in shares)	(260,000)	(105,000)
Balance at the end of the period (in shares)	437,000	635,000
Weighted-Average Exercise Price per Share
Balance at the beginning of the period (in dollars per share)	$ 1.35	$ 1.62
Granted (in dollars per share)	$ 1.34	$ 1.05
Forfeited/expired (in dollars per share)	$ 1.55	$ 2.38
Balance at the end of the period (in dollars per share)	$ 1.24	$ 1.35
Equity compensation plans not approved by security holders | Stock options
Stock option activity and related information
Balance at the beginning of the period (in shares)	80,000
Granted (in shares)	35,000	80,000
Forfeited/expired (in shares)	(5,000)
Balance at the end of the period (in shares)	110,000	80,000
Weighted-Average Exercise Price per Share
Balance at the beginning of the period (in dollars per share)	$ 1.08
Granted (in dollars per share)	$ 1.37	$ 1.08
Forfeited/expired (in dollars per share)	$ 1.05
Balance at the end of the period (in dollars per share)	$ 1.15	$ 1.08