Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 1,678,184	$ 1,911,950
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	932,500	801,689
Gain on disposal of equipment	(17,613)	(116,721)
Deferred income taxes	(94,000)	40,000
Changes in operating assets and liabilities:
Accounts receivable, net	(450,535)	(1,670,471)
Inventories, net	(401,963)	41,851
Other current assets	(139,946)	72,085
Accounts payable	350,207	413,512
Accrued wages and salaries	462,838	555,361
Other accrued expenses	(56,565)	237,527
Unearned revenue and customer deposits	(35,098)	125,868
Net cash provided by operating activities	2,228,009	2,412,651
Cash flows from investing activities:
Capital expenditures	(1,329,170)	(2,751,108)
Proceeds from the sale of equipment	18,700	165,200
Proceeds from certificates of deposit	2,639,348	5,363,000
Purchases of certificates of deposit	(2,241,000)	(4,233,348)
Net cash used in investing activities	(912,122)	(1,456,256)
Cash flows from financing activities:
Cash dividends paid	(908,164)	(434,760)
Net cash used in financing activities	(908,164)	(434,760)
Net increase in cash and cash equivalents	407,723	521,635
Cash and cash equivalents at beginning of period	443,608	392,810
Cash and cash equivalents at end of period	851,331	914,445
Supplemental schedule of non-cash investing activities:
Capital expenditures in accounts payable	$ 19,966	$ 9,212