Stockholders' Equity (Details) (USD $)	3 Months Ended			6 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Class of Stock [Line Items]
Beginning balance, value	$ 24,014,613	$ 24,764,671		$ 24,764,671
Beginning balance, shares	36,669,509	36,664,097		36,664,097
Issuance of common stock under employee stock purchase plan, value	18,029	3,572
Issuance of common stock under employee stock purchase plan, shares	28,618	5,412
Issuance of common stock under stock bonus plan, value	36,499
Issuance of common stock under stock bonus plan, shares	166,231
Compensation expense from employee and director stock option and common stock grants	238,853	162,724
Net loss	(412,269)	(916,354)	(2,563,548)	(1,328,623)	(3,850,982)
Ending balance, value	23,895,725	24,014,613		23,895,725
Ending balance, shares	36,864,358	36,669,509		36,864,358
Common Stock [Member]
Class of Stock [Line Items]
Beginning balance, value	366,695	366,641		366,641
Issuance of common stock under employee stock purchase plan, value	286	54
Issuance of common stock under stock bonus plan, value	1,663
Ending balance, value	368,644	366,695		368,644
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Beginning balance, value	115,739,573	115,573,331		115,573,331
Issuance of common stock under employee stock purchase plan, value	17,743	3,518
Issuance of common stock under stock bonus plan, value	34,836
Compensation expense from employee and director stock option and common stock grants	238,853	162,724
Ending balance, value	116,031,005	115,739,573		116,031,005
Accumulated Deficit [Member]
Class of Stock [Line Items]
Beginning balance, value	(92,091,655)	(91,175,301)		(91,175,301)
Net loss	(412,269)	(916,354)
Ending balance, value	$ (92,503,924)	$ (92,091,655)		$ (92,503,924)