Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,525,429	$ 1,553,672
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,841,359	2,556,730
Idle lease accrual	(69,108)	142,678
Stock-based compensation	239,440	311,539
Deferred taxes	(1,559,000)	(616,000)
Change in operating assets and liabilities:
Accounts receivable	(153,256)	626,222
Prepaid expenses and other assets	(102,383)	116,167
Accounts payable	71,964	(473,100)
Accrued expenses	63,489	(282,668)
Unearned revenue	(224,305)	(1,521,754)
Deferred rent	(146,632)	(116,839)
Net cash provided by operating activities	2,486,997	2,296,647
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment	(371,738)	(516,649)
Additions to internal use software	(1,342,152)	(1,425,666)
Purchases of investments	(15,184,988)	(13,443,560)
Sales of investments	2,273,152	1,350,000
Maturities of investments	12,625,914	7,308,495
Return of security deposits	44,615	134,517
Net cash used in investing activities	(1,955,197)	(6,592,863)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on capital lease obligations	(96,031)
Proceeds from exercise of stock options	74,625	151,648
Net cash (used in) / provided by financing activities	(21,406)	151,648
Net increase / (decrease) in cash and cash equivalents	510,394	(4,144,568)
Cash and cash equivalents, beginning of period	3,378,006	7,522,574
Cash and cash equivalents, end of period	3,888,400	3,378,006
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unrealized gain on available-for-sale investments	500	1,946
Purchases under capital lease obligations	(115,134)
Property and equipment additions in accounts payable	(152,383)	(3,309)
Property and equipment additions in accrued and other current and long-term liabilities	(581,066)
Internal use software additions in accounts payable	(185,973)	(82,608)
Non-cash proceeds from sale of equipment		$ 2,790