STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 3,489,283	$ 2,613,720	$ 1,527,295
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	370,020	284,911	336,795
Deferred income taxes	406,853	218,154	130,434
Change in excess tax benefit on equity awards	0	0	(54,408)
Stock compensation expense	418,077	394,972	394,498
Changes in operating assets and liabilities:
Accounts receivable	(585,155)	(889,737)	382,371
Prepaid expenses and other current assets, including income tax receivable	(428,769)	(37,389)	442,453
Accounts payable	262,011	519,049	(464,110)
Accrued expenses	19,486	211,472	(178,026)
Deferred revenue	(16,605)	(19,755)	(117,720)
Net cash provided by operating activities	3,935,201	3,295,397	2,399,582
Cash flows from investing activities:
Maturities of short-term investments	2,018,452	0	0
Purchases of short-term investments	0	(1,012,016)	(1,006,436)
Increase in other long-term assets	(130,874)	(29,737)	(14,582)
Purchases of property and equipment	(1,358,790)	(817,960)	(35,427)
Net cash provided by (used in) investing activities	528,788	(1,859,713)	(1,056,445)
Cash flows from financing activities:
Dividends paid	(2,510,861)	(2,500,268)	(3,014,101)
Proceeds from employee stock plans and stock option exercises, net of tax withholding	(86,992)	(49,261)	(39,381)
Acquisition of treasury stock	(22,391)	(6,034)	(79,407)
Net cash used in financing activities	(2,620,244)	(2,555,563)	(3,132,889)
Net increase (decrease) in cash and cash equivalents	1,843,745	(1,119,879)	(1,789,752)
Cash and cash equivalents, beginning of year	3,720,488	4,840,367	6,630,119
Cash and cash equivalents, end of year	5,564,233	3,720,488	4,840,367
Supplemental disclosures of cash flow information:
Cash paid for income taxes	2,401,957	2,009,694	112,449
Non-cash investing and financing activities:
Issuance of restricted stock awards	$ 131	$ 78	$ 93