Segment Information (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed operating data for segments
Subscription revenue	$ 7,826,701	$ 6,747,585	$ 22,647,158	$ 20,201,463
Cost of sales of subscription revenue	1,475,495	1,550,435	5,006,705	4,623,673
Gross profit	6,351,206	5,197,150	17,640,453	15,577,790
Operating expenses:
Sales and marketing	1,908,668	1,656,187	5,459,591	4,988,681
Product development	660,620	574,066	1,740,619	1,562,224
General and administrative expenses	2,937,199	2,632,106	8,865,783	8,384,599
Total operating expenses	5,506,487	4,862,359	16,065,993	14,935,504
Other income (expenses):
Interest and other income	15,649	19,321	47,921	61,646
Interest expense	(531)	(65,145)	(128,133)	(214,807)
Total other income (expenses)	15,118	(45,824)	(80,212)	(153,161)
Income (loss) before income taxes and discontinued operations	859,837	288,967	1,494,248	489,125
Income (loss) from discontinued operations, before income taxes	(194,313)	1,231	(12,844,365)	1,253,481
Reis Services [Member]
Condensed operating data for segments
Subscription revenue	7,827,000	6,747,000	22,647,000	20,201,000
Cost of sales of subscription revenue	1,476,000	1,550,000	5,007,000	4,623,000
Gross profit	6,351,000	5,197,000	17,640,000	15,578,000
Operating expenses:
Sales and marketing	1,908,000	1,656,000	5,459,000	4,989,000
Product development	661,000	574,000	1,741,000	1,562,000
General and administrative expenses	1,691,000	1,563,000	5,013,000	4,739,000
Total operating expenses	4,260,000	3,793,000	12,213,000	11,290,000
Other income (expenses):
Interest and other income	16,000	18,000	47,000	57,000
Interest expense	(1,000)	(65,000)	(128,000)	(215,000)
Total other income (expenses)	15,000	(47,000)	(81,000)	(158,000)
Income (loss) before income taxes and discontinued operations	2,106,000	1,357,000	5,346,000	4,130,000
Income (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
Income (loss) from discontinued operations, before income taxes	2,000	1,000	(12,648,000)	1,253,000
Other segment [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	1,246,000	1,070,000	3,853,000	3,646,000
Total operating expenses	1,246,000	1,070,000	3,853,000	3,646,000
Other income (expenses):
Interest and other income		2,000	1,000	5,000
Interest expense
Total other income (expenses)		2,000	1,000	5,000
Income (loss) before income taxes and discontinued operations	(1,246,000)	(1,068,000)	(3,852,000)	(3,641,000)
Income (loss) from discontinued operations, before income taxes	$ (196,000)		$ (196,000)