CONDENSED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (87,750)	$ (62,406)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	135,123	115,997
Amortization	13,537	12,346
Stock based compensation	2,617	4,416
Loss on intangible asset abandonment		22,324
Deferred income taxes	65,000
Changes in operating assets and liabilities:
Trade receivables	(124,341)	(38,098)
Inventories	(286,326)	(177,801)
Prepaid expenses and other assets	(27,766)	(70,769)
Income taxes receivable	(72,207)	(35,065)
Accounts payable	148,885	276,935
Accrued liabilities	59,925	111,116
Income taxes payable	(74,275)
Net cash provided by (used in) operating activities	(247,578)	158,995
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(207,453)	(229,897)
Purchases of intangibles	(35,840)	(7,563)
Purchases of short-term investments	(204,806)	(410,833)
Proceeds from maturity of short-term investments	203,483	608,749
Net cash used in investing activities	(244,616)	(39,544)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	40,997	3,750
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(451,197)	123,201
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	967,943	1,867,165
CASH AND CASH EQUIVALENTS AT END OF PERIOD	516,746	1,990,366
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash received (paid) for income taxes, net of taxes paid of $10,671 in 2013 and taxes received of $1,341 in 2012	$ 2,355	$ 4,846