CONDENSED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 321,524	$ 408,789
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	416,068	361,811
Amortization	39,620	41,612
Stock based compensation	10,143	13,391
Gain on disposal of property, plant and equipment	(2,979)
Loss on intangible asset abandonment		22,324
Deferred income taxes	65,000
Changes in working capital components:
Trade receivables	160,598	(87,129)
Inventories	163,166	(340,484)
Prepaid expenses and other assets	(10,785)	(87,101)
Income taxes receivable	(91,671)	59,322
Accounts payable	66,132	(43,109)
Accrued expenses	83,191	127,169
Income taxes payable	(69,397)	90,344
Net cash provided by operating activities	1,150,610	566,939
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(585,806)	(372,217)
Proceeds from disposal of property, plant and equipment	24,507
Purchases of intangibles	(69,309)	(30,386)
Purchases of short-term investments	(1,814,878)	(1,649,988)
Proceeds on sale of short-term investments	1,442,939	1,837,699
Net cash used in investing activities	(1,002,547)	(214,892)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	63,492	30,123
NET INCREASE IN CASH AND CASH EQUIVALENTS	211,555	382,170
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	967,943	1,867,165
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,179,498	2,249,335
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes, net of taxes received of $13,026 in 2013 and $18,650 paid in 2012.	$ 169,068	$ 57,626