CONDENSED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,529,978	$ 2,937,271
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	751,306	642,580
Stock-based compensation	448,417	386,297
Changes in assets and liabilities:
Accounts receivable	(1,388,452)	(672,737)
Prepaid expenses, other current assets, and income tax receivable	286,221	622,123
Accounts payable	172,696	(92,708)
Accrued expenses	(667,621)	184,916
Deferred income taxes	(176,648)	(155,217)
Net cash provided by operating activities	1,955,897	3,852,525
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of equipment and leasehold improvements	(6,993,673)	(835,735)
Cost of internally developed software	(321,394)	(540,097)
Other assets	(202,283)	(227,482)
Net cash used in investing activities	(7,517,350)	(1,603,314)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from exercise of stock options	47,564	20,839
Proceeds from issuance of stock, net of tax withholding	(36,968)	(111,249)
Proceeds from equipment financing	6,999,626	0
Payments of equipment financing	(401,562)	0
Cash dividends paid	(2,406,007)	(2,381,845)
Net cash provided by (used in) financing activities	4,202,653	(2,472,255)
Net decrease in cash and cash equivalents	(1,358,800)	(223,044)
Cash and cash equivalents, beginning of period	3,970,512	3,065,785
Cash and cash equivalents, end of period	2,611,712	2,842,741
Supplemental Disclosures of Cash Flow Information:
Cash paid for income taxes	461,920	643,000
Cash paid for interest	42,285	0
Purchases of equipment through accrued liabilities	$ 191,566	$ 170,642