CONDENSED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,707,016	$ 3,051,095
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	419,541	258,708
Stock-based compensation	337,078	304,408
Deferred income taxes	(136,180)	(122,322)
Changes in operating assets and liabilities:
Accounts receivable	(852,362)	(2,291,612)
Prepaid expenses, other current assets, and income tax receivable	36,183	(135,247)
Accounts payable	304,759	(405,903)
Accrued expenses	(337,391)	138,616
Deferred revenue	0	(16,605)
Net cash provided by operating activities	2,478,644	781,138
CASH FLOWS USED IN INVESTING ACTIVITIES:
Purchases of short-term investments	0	(13,198,341)
Sales of short-term investments	0	15,216,793
Purchases of equipment and leasehold improvements	(1,837,200)	(912,620)
Other assets	(81,889)	(113,939)
Net cash (used in) provided by investing activities	(1,919,089)	991,893
CASH FLOWS USED IN FINANCING ACTIVITIES:
Proceeds from issuance of stock, net of tax withholding	(94,559)	(86,992)
Acquisition of treasury stock	0	(22,391)
Cash dividends paid	(2,365,730)	(1,882,611)
Net cash used in financing activities	(2,460,289)	(1,991,994)
Net decrease in cash	(1,900,734)	(218,963)
Cash and Cash Equivalents, beginning of period	5,564,233	3,720,488
Cash and Cash Equivalents, end of period	3,663,499	3,501,525
Supplemental Disclosures of Cash Flow Information:
Cash paid for income taxes	$ 1,208,800	$ 1,729,000