Consolidated Statements of Cash Flows (unaudited) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 1,880,119	$ 6,530,300
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	43,529	32,349
Stock-based compensation expense	202,085	391,138
Deferred tax assets	619,410	(3,051,197)
Changes in operating assets and liabilities:
Accounts receivable	31,523	286,236
Prepaid expenses and other current assets	110,655	(223,807)
Accounts payable and accrued expenses	15,607	(2,832,456)
Deferred revenue	(327,824)	(374,494)
Net cash provided by operating activities	2,575,104	758,069
Cash flows from investing activities:
Maturity of marketable investments	5,000,000	5,360,970
Purchases of marketable investments	(5,190,000)	(5,000,000)
Payment for royalty buy down	(1,500,000)	0
Net cash provided by (used in) investing activities	(1,690,000)	360,970
Cash flows from financing activities:
Proceeds from stock option exercises	148,425	82,450
Payments for repurchase of common stock	(674,501)	(360,447)
Excess tax benefits from share-based payment arrangements	268,001	483,869
Net cash provided by (used in) in financing activities	(258,075)	205,872
Increase in cash and cash equivalents	627,029	1,324,911
Cash and cash equivalents at beginning of year	3,196,831	2,470,852
Cash and cash equivalents at end of period	3,823,860	3,795,763
Cash paid during the year for:
Interest	0	0
Taxes	$ 162,000	$ 190,000