CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,610,311	$ 529,851
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,070,847	707,303
Change in excess tax benefit related to stock	0	86,433
Stock-based compensation	348,193	342,992
Changes in assets and liabilities:
Accounts receivable	(1,921,336)	(438,022)
Prepaid expenses, other current assets, and income tax receivable	659,121	876,858
Accounts payable	241,216	(255,519)
Accrued expenses and accrued income taxes	407,216	178,497
Deferred income taxes	28,060	(166,851)
Net cash provided by operating activities	2,443,628	1,861,542
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of equipment and leasehold improvements	(709,338)	(699,192)
Cost of internally developed software	(78,837)	(220,019)
Other assets	(56,758)	(149)
Net cash used in investing activities	(844,933)	(919,360)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from exercise of stock options	0	91,556
Proceeds from issuance of stock, net of tax withholding	(148,644)	(226,610)
Proceeds from equipment financing	609,844	0
Payments of equipment financing	(840,309)	(699,963)
Cash dividends paid	(1,629,145)	(1,615,258)
Net cash used in financing activities	(2,008,254)	(2,450,275)
Net decrease in cash and cash equivalents	(409,559)	(1,508,093)
Cash and cash equivalents, beginning of period	2,689,464	3,612,153
Cash and cash equivalents, end of period	2,279,905	2,104,060
Supplemental Disclosures of Cash Flow Information:
Cash paid for income taxes	0	2,870
Cash paid for interest	70,559	64,679
Purchases of equipment through accrued liabilities	$ 391,622	$ 266,976