Statements of Cash Flows (USD $)	3 Months Ended
	Jun. 30, 2011		Jun. 30, 2010
OPERATING ACTIVITIES
Net income	$ 3,439,228		$ 3,101,097
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	113,537		89,476
Deferred income taxes	(6,948)		20,857
Changes in operating assets and liabilities:
Accounts receivable	193,257		1,042,793
Inventories	(24,871)		(141,750)
Prepaid expenses and other assets	147,642		(67,355)
Accounts payable and accrued expenses	1,213,150		1,400,250
Deferred revenue			(20,833)
Net cash provided by operating activities	5,074,995		5,424,535
INVESTING ACTIVITIES
Purchases of fixed assets	(199,371)		(61,953)
Purchases of marketable securities	(5,011,799)		(5,699,849)
Proceeds from maturities and sales of marketable securities	861,397		602,272
Net cash used in investing activities	(4,349,773)		(5,159,530)
FINANCING ACTIVITIES
Net cash provided by financing activities
Increase in cash and cash equivalents	725,222		265,005
Cash and cash equivalents at beginning of period	952,209	[1]	1,389,288
Cash and cash equivalents at end of period	1,677,431		1,654,293
Supplemental disclosures of cash flow information:
Cash (refunded) paid during the period for income taxes	$ (2,435)		$ 4,742

[1] The March 31, 2011 Balance Sheet is derived from the audited financial statements contained in our Annual Report on Form 10-K for the fiscal year ended March 31, 2011.