Segment Information (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed operating data for segments
Subscription revenue	$ 8,498,309	$ 7,522,085	$ 16,732,637	$ 14,820,457
Cost of sales of subscription revenue	1,674,793	1,685,496	3,356,197	3,531,210
Gross profit	6,823,516	5,836,589	13,376,440	11,289,247
Operating expenses:
Sales and marketing	2,031,618	1,821,604	4,000,584	3,550,923
Product development	792,199	566,405	1,513,765	1,079,999
General and administrative expenses	3,104,751	2,976,316	6,274,062	5,928,584
Total operating expenses	5,928,568	5,364,325	11,788,411	10,559,506
Other income (expenses):
Interest and other income	2,331	16,207	4,529	32,272
Interest expense	(28,283)	(74,439)	(56,496)	(127,602)
Total other income (expenses)	(25,952)	(58,232)	(51,967)	(95,330)
Income (loss) before income taxes and discontinued operations	868,996	414,032	1,536,062	634,411
(Loss) from discontinued operations, before income taxes	(62,000)	1,774,000	(313,000)	(12,650,000)
Reis Services [Member]
Condensed operating data for segments
Subscription revenue	8,498,000	7,522,000	16,732,000	14,820,000
Cost of sales of subscription revenue	1,675,000	1,685,000	3,356,000	3,531,000
Gross profit	6,823,000	5,837,000	13,376,000	11,289,000
Operating expenses:
Sales and marketing	2,032,000	1,822,000	4,001,000	3,551,000
Product development	791,000	566,000	1,513,000	1,080,000
General and administrative expenses	1,723,000	1,679,000	3,519,000	3,322,000
Total operating expenses	4,546,000	4,067,000	9,033,000	7,953,000
Other income (expenses):
Interest and other income	2,000	16,000	4,000	31,000
Interest expense	(28,000)	(74,000)	(56,000)	(127,000)
Total other income (expenses)	(26,000)	(58,000)	(52,000)	(96,000)
Income (loss) before income taxes and discontinued operations	2,251,000	1,712,000	4,291,000	3,240,000
(Loss) from discontinued operations, before income taxes
Discontinued Operations [Member]
Condensed operating data for segments
Subscription revenue
Cost of sales of subscription revenue
Gross profit
Operating expenses:
Sales and marketing
Product development
General and administrative expenses
Total operating expenses
Other income (expenses):
Interest and other income
Interest expense
Total other income (expenses)
Income (loss) before income taxes and discontinued operations
(Loss) from discontinued operations, before income taxes		1,774,000		(12,650,000)
Other [Member]
Condensed operating data for segments
Subscription revenue
Cost of sales of subscription revenue
Gross profit
Operating expenses:
Sales and marketing
Product development
General and administrative expenses	1,382,000	1,298,000	2,755,000	2,607,000
Total operating expenses	1,382,000	1,298,000	2,755,000	2,607,000
Other income (expenses):
Interest and other income				1,000
Interest expense
Total other income (expenses)				1,000
Income (loss) before income taxes and discontinued operations	(1,382,000)	(1,298,000)	(2,755,000)	(2,606,000)
(Loss) from discontinued operations, before income taxes	$ (62,000)		$ (313,000)