Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 6,959,083	$ 2,726,718
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	647,071	196,676
Stock-based compensation expense	72,305	16,062
Deferred tax expense	441,211	22,241
Gain on the sale of fixed assets	0	(1,150)
Changes in operating assets and liabilities:
Accounts receivable	(1,273,079)	1,924,724
Income tax receivable	(521,121)	(495,443)
Investment interest receivable	(88,942)	(9,535)
Prepaid expenses	(47,210)	(56,226)
Patent costs	(24,204)	(186,138)
Accounts payable and accrued expenses	107,372	(117,049)
Deferred revenue	(37,034)	(46,910)
Net cash provided by operating activities	6,235,452	3,973,970
Cash flows from investing activities:
Maturity of marketable investments	11,043,544	6,015,958
Purchases of marketable investments	(24,422,334)	(6,843,677)
Proceeds from sale of fixed asset	0	1,150
Net cash used in investing activities	(13,378,790)	(826,569)
Cash flows from financing activities:
Proceeds from stock option exercises	2,813,984	204,550
Payments for repurchase of common stock	(1,182,068)	(750,598)
Excess tax benefits from share-based payment arrangements	3,188,682	1,485,107
Net cash provided by financing activities	4,820,598	939,059
(Decrease) increase in cash and cash equivalents	(2,322,740)	4,086,460
Cash and cash equivalents at beginning of year	9,810,816	5,624,860
Cash and cash equivalents at end of period	7,488,076	9,711,320
Cash paid during the year for:
Interest	0	0
Taxes	$ 546,000	$ 415,000