Consolidated Statements of Cash Flows (unaudited) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 1,409,072	$ 6,260,464
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	29,019	21,220
Stock-based compensation expense	175,685	264,907
Deferred tax assets	416,055	(3,103,944)
Changes in operating assets and liabilities:
Accounts receivable	416,072	1,108,734
Prepaid expenses and other current assets	72,403	(59,477)
Accounts payable and accrued expenses	97,438	(1,889,632)
Deferred revenue	(218,550)	(265,219)
Net cash provided by operating activities	2,397,194	2,337,053
Cash flows from investing activities:
Maturity of marketable investments	2,000,000	0
Purchases of marketable investments	(2,000,000)	0
Payment for royalty buy down	(1,500,000)	0
Net cash used in investing activities	(1,500,000)	0
Cash flows from financing activities:
Proceeds from stock option exercises	78,000	72,450
Payments for repurchase of common stock	(485,904)	(206,347)
Excess tax benefits from share-based payment arrangements	102,052	346,539
Net provided by (cash used) in financing activities	(305,852)	212,642
Increase in cash and cash equivalents	591,342	2,549,695
Cash and cash equivalents at beginning of year	3,196,831	2,470,852
Cash and cash equivalents at end of period	3,788,173	5,020,547
Cash paid during the year for:
Interest	0	0
Taxes	$ 92,000	$ 0