CONDENSED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 205,362	$ 180,677
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	275,433	235,015
Amortization	26,448	27,295
Stock based compensation	6,380	8,964
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	(323,479)	(236,442)
Inventories	246,113	(450,296)
Prepaid expenses and other assets	(51,591)	(20,954)
Income taxes receivable	(17,925)	59,322
Accounts payable	(276,851)	(53,252)
Accrued expenses	(64,178)	(8,068)
Income taxes payable	(69,625)	47,517
Net cash provided by (used in) operating activities	18,108	(187,898)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(358,097)	(321,441)
Proceeds from disposal of property, plant and equipment	24,507
Purchases of intangibles	(59,762)	(19,314)
Purchases of short-term investments	(413,934)	(1,441,900)
Proceeds on sale of short-term investments	1,027,219	1,629,980
Net cash provided by (used in) investing activities	219,933	(152,675)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	63,492	11,250
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	301,533	(329,323)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	967,943	1,867,165
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,269,476	1,537,842
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid (received) for income taxes, net of taxes received of $13,026 in 2013 and $6,238 paid in 2012.	$ 48,835	$ (12,412)