Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 2,726,718	$ 3,560,045
Adjustments to reconcile net income to net cash provided By operating activities:
Amortization of patent expense	94,230	48,242
Amortization of deferred royalty buydown	102,446	0
Stock-based compensation expense	16,062	106,621
Deferred tax assets	22,241	424
Gain on the sale of fixed assets	(1,150)	0
Changes in operating assets and liabilities:
Accounts receivable	1,915,189	37,678
Prepaid expenses and other current assets	(551,668)	(294,715)
Accounts payable and accrued expenses	(303,187)	86,204
Deferred revenue	(46,910)	(116,242)
Net cash provided by operating activities	3,973,971	3,428,257
Cash flows from investing activities:
Maturity of marketable investments	6,015,958	7,790,000
Purchases of marketable investments	(6,843,677)	(9,396,964)
Proceeds from sale of fixed asset	1,150	0
Net cash used in investing activities	(826,569)	(1,606,964)
Cash flows from financing activities:
Proceeds from stock option exercises	204,550	10,000
Payments for repurchase of common stock	(750,599)	(608,052)
Excess tax benefits from share-based payment arrangements	1,485,107	0
Net cash provided by (used in) financing activities	939,058	(598,052)
Increase in cash and cash equivalents	4,086,460	1,223,241
Cash and cash equivalents at beginning of year	5,624,860	3,383,737
Cash and cash equivalents at end of period	9,711,320	4,606,978
Cash paid during the year for:
Interest	0	0
Taxes	$ 415,279	$ 1,778,500