CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning Balance at Mar. 31, 2010	$ 66,120,376	$ 307,618	$ 183,733,863		$ (117,921,105)
Beginning Balance (in shares) at Mar. 31, 2010		30,761,807
Net income (loss)	(43,509)				(43,509)
Share-based compensation expense	1,003,266		1,003,266
Exercise of stock options (in shares)		50,450
Exercise of stock options	6,571	505	6,066
Ending Balance at Mar. 31, 2011	67,086,704	308,123	184,743,195		(117,964,614)
Ending Balance (in shares) at Mar. 31, 2011		30,812,257
Net income (loss)	(1,612,625)				(1,612,625)
Unrealized gain on investments	6,338			6,338
Foreign currency translation adjustment	107,289			107,289
Share-based compensation expense	730,136		730,136
Repurchase and retirement of treasury stock (in shares)		(100,000)
Repurchase and retirement of treasury stock	(330,867)	(1,000)	(600,492)		270,625
Exercise of stock options (in shares)		2,500
Exercise of stock options	25	25
Ending Balance at Dec. 31, 2011	65,987,000	307,148	184,872,839	113,627	(119,306,614)
Ending Balance (in shares) at Dec. 31, 2011		30,714,757
Net income (loss)	14,156,037				14,156,037
Unrealized gain on investments	7,792			7,792
Foreign currency translation adjustment	1,790,551			1,790,551
Share-based compensation expense	1,024,152		1,024,152
Exercise of stock options (in shares)	609,400	480,284
Exercise of stock options	1,159,064	4,802	1,154,262
Ending Balance at Dec. 31, 2012	$ 84,124,596	$ 311,950	$ 187,051,253	$ 1,911,970	$ (105,150,577)
Ending Balance (in shares) at Dec. 31, 2012		31,195,041