Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 934,166	$ 704,543
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	492,286	481,542
Net gain on disposal of property and equipment	(57,500)	(189,063)
Deferred income taxes	(26,000)	(54,000)
Changes in operating assets and liabilities:
Accounts receivable, net	(1,022,466)	(1,029,393)
Inventories, net	(15,438)	(585,583)
Other current assets	102,359	61,831
Accounts payable	300,212	193,225
Accrued wages and salaries	319,373	213,577
Other accrued expenses	(54,324)	56,397
Unearned revenue and customer deposits	(102,490)	10,044
Net cash provided by (used in) operating activities	870,178	(136,880)
Cash flows from investing activities:
Capital expenditures	(432,848)	(663,775)
Proceeds from the sale of property and equipment	57,500	412,390
Proceeds from certificates of deposit	2,244,000	2,155,000
Purchases of certificates of deposit	(2,551,000)	(995,000)
Net cash (used in) provided by investing activities	(682,348)	908,615
Cash flows from financing activities:
Cash dividends paid	(289,839)	(231,872)
Net cash used in financing activities	(289,839)	(231,872)
Net (decrease) increase in cash and cash equivalents	(102,009)	539,863
Cash and cash equivalents at beginning of period	704,345	725,524
Cash and cash equivalents at end of period	602,336	1,265,387
Supplemental schedule of non-cash investing activities:
Capital expenditures in accounts payable	$ 80,558	$ 66,496