Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,780,642	$ 10,304,983	$ 4,047,122
Adjustments to reconcile to net cash provided by operating activities:
Deferred tax provision	1,766,000	4,449,000	2,113,783
Depreciation	706,906	429,498	382,829
Amortization of intangible assets	5,923,269	5,148,546	4,828,452
Stock based compensation charges	2,098,553	1,772,679	1,702,163
Changes in assets and liabilities:
Restricted cash and investments	212,268	357	4,077
Accounts receivable, net	2,997,664	(1,114,106)	(1,240,479)
Prepaid and other assets	(40,721)	(332,450)	40,320
Accrued expenses and other liabilities	(382,084)	1,170,929	446,044
Liability for option cancellations	0	0	(136,563)
Deferred revenue	(260,399)	2,406,212	2,601,109
Net cash provided by operating activities	15,802,098	24,235,648	14,788,857
CASH FLOWS FROM INVESTING ACTIVITIES:
Website and database development additions	(8,508,597)	(5,804,090)	(3,822,745)
Furniture, fixtures and equipment additions	(4,818,683)	(383,059)	(380,318)
Proceeds from sale of furniture, fixtures and equipment	2,091	0	0
Net cash (used in) investing activities	(13,325,189)	(6,187,149)	(4,203,063)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends	(7,746,655)	(6,337,568)	(3,697,588)
Registration statement costs	0	(89,331)
Proceeds from option exercises	153,000	284,250	428,750
Payments for option cancellations and restricted stock units	(701,159)	(992,971)	(131,778)
Payment of financing cost	(205,552)	0	0
Stock repurchases	(1,143,913)	0	0
Net cash (used in) financing activities	(9,644,279)	(7,135,620)	(3,400,616)
Net (decrease) increase in cash and cash equivalents	(7,167,370)	10,912,879	7,185,178
Cash and cash equivalents, beginning of year	28,657,956	17,745,077	10,559,899
Cash and cash equivalents, end of year	21,490,586	28,657,956	17,745,077
SUPPLEMENTAL INFORMATION:
Cash paid during the year for interest	42,500	25,347	25,347
Cash paid during the year for income taxes, net of refunds	722,105	651,502	229,982
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrual for furniture, fixtures and equipment additions	346,330
Disposal of fully depreciated furniture, fixtures and equipment	2,074,098	138,160	130,115
Accrual for website and database development costs		350,000
Disposal of fully depreciated website costs			2,895
Shares issued for vested employee restricted stock units	$ 1,048	$ 1,297	2,894
Shares issued for settlement of vested director restricted stock units			811
Exercise of stock options through the receipt of tendered shares			$ 36,246