Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 2,479,029	$ 1,745,741
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,093,062	993,951
Gain on the sale of equipment	(114,658)	(67,946)
Deferred income taxes	119,000	171,000
Changes in operating assets and liabilities:
Accounts receivable, net	(932,838)	(179,506)
Inventories, net	55,584	275,668
Other current assets	126,811	(74,595)
Accounts payable	(108,686)	(59,606)
Accrued wages and salaries	150,419	34,731
Other accrued expenses	149,601	6,651
Unearned revenue and customer deposits	41,161	(66,747)
Net cash provided by operating activities	3,058,485	2,779,342
Cash flows from investing activities:
Capital expenditures	(3,444,876)	(1,092,759)
Proceeds from the sale of equipment	165,200	79,400
Proceeds from certificates of deposit	7,088,000	5,160,000
Purchases of certificates of deposit	(6,207,348)	(6,368,000)
Net cash used in investing activities	(2,399,024)	(2,221,359)
Cash flows from financing activities:
Cash dividends paid	(608,663)	(869,518)
Net cash used in financing activities	(608,663)	(869,518)
Net increase (decrease) in cash and cash equivalents	50,798	(311,535)
Cash and cash equivalents at beginning of year	392,810	704,345
Cash and cash equivalents at end of year	443,608	392,810
Net cash paid for income taxes	877,494	812,298
Supplemental schedule of non-cash investing activities:
Capital expenditures in accounts payable	$ 29,982	$ 94,987