STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 3,206,081	$ 3,805,210	$ 2,979,629
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,050,281	872,171	586,968
Deferred income taxes	1,398,711	416,684	437,720
Stock compensation expense	608,645	538,304	458,167
Changes in operating assets and liabilities:
Accounts receivable	290,731	251,904	(129,792)
Prepaid expenses, other current assets and income tax receivable	(1,185,641)	353,389	(547,895)
Accounts payable	334,521	(159,239)	(292,055)
Accrued expenses	(1,246,096)	(126,876)	(406,011)
Net cash provided by operating activities	4,457,233	5,951,547	3,086,731
Cash flows from investing activities:
Increase in long-term assets; capitalized patent costs	(243,704)	(226,130)	(121,375)
Purchases of property and equipment and capitalized software development costs	(7,564,676)	(1,531,632)	(2,214,048)
Net cash used in investing activities	(7,808,380)	(1,757,762)	(2,335,423)
Cash flows from financing activities:
Dividends paid	(3,212,267)	(3,178,909)	(3,156,592)
Tax withholding related to vested shares from employee stock plans	(43,028)	(110,149)	(93,164)
Proceeds from equipment financing	6,999,626	0	0
Payments of equipment financing	(751,543)	0	0
Net cash provided by (used in) financing activities	2,992,788	(3,289,058)	(3,249,756)
Net increase (decrease) in cash and cash equivalents	(358,359)	904,727	(2,498,448)
Cash and cash equivalents, beginning of year	3,970,512	3,065,785	5,564,233
Cash and cash equivalents, end of year	3,612,153	3,970,512	3,065,785
Supplemental disclosures of cash flow information:
Cash paid for income taxes	1,167,920	1,233,000	1,715,000
Cash paid for interest	77,046	0	0
Non-cash investing and financing activities:
Issuance of restricted stock awards	260	185	185
Exercise of stock options	32,722	20,817	0
Purchases of equipment through accrued liabilities	$ 149,509	$ 1,161,255	$ 497,696