Condensed Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 561,565	$ 778,956
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	299,169	304,347
Amortization	37,302	39,214
Stock based compensation	19,502	21,952
Gain on sale of equipment and vehicles		(10,766)
Loss on intangible asset abandonment		29,918
Changes in working capital components:
Trade receivables	(384,886)	(171,507)
Inventories	(339,825)	(266,205)
Prepaid expenses and other assets	(29,605)	(33,316)
Accounts payable	248,126	103,216
Accrued expenses	65,148	(6,204)
Income taxes payable	(10,744)	(74,189)
Net cash provided by operating activities	465,752	715,416
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(465,530)	(155,681)
Proceeds from sale of equipment and vehicles		19,200
Purchases of intangibles	(54,675)	(35,421)
Purchases of short-term investments	(2,240,321)	(2,216,089)
Proceeds on sale of short-term investments	2,425,546	807,041
Net cash used in investing activities	(334,980)	(1,580,950)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchase of common stock	(2,079)	(15,130)
Proceeds from exercise of stock options	69,710	35,240
Net cash provided by financing activities	67,631	20,110
NET INCREASE (DECREASE) IN CASH	198,403	(845,424)
CASH AT BEGINNING OF PERIOD	1,291,383	1,304,586
CASH AT END OF PERIOD	1,489,786	459,162
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes, net of refunds received of $4,090 and $81,422, respectively	230,894	386,299
SUPPLEMENTAL SCHEDULE OF NONCASH OPERATING AND INVESTING ACTIVITIES
Equipment transferred from inventory to property, plant and equipment	$ 227,039

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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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