Condensed Balance Sheets (USD $)	Sep. 30, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash	$ 2,249,335	$ 1,867,165
Short-term investments	1,647,292	1,835,003
Trade receivables, less allowance of $60,000 in 2012 and $51,000 in 2011	2,268,076	2,180,947
Inventories	2,575,318	2,234,834
Prepaid expenses and other assets	170,024	82,923
Income taxes receivable		59,322
Deferred income taxes	144,000	144,000
Total current assets	9,054,045	8,404,194
PROPERTY, PLANT AND EQUIPMENT, at cost:
Land and building	6,064,903	5,982,799
Machinery and equipment	3,272,369	3,021,053
Office equipment	700,957	662,160
Vehicles	235,000	235,000
Gross property, plant, and equipment, at cost	10,273,229	9,901,012
Less accumulated depreciation	4,825,921	4,464,110
Net property, plant, and equipment, at cost	5,447,308	5,436,902
INTANGIBLE ASSETS, less accumulated amortization of $469,066 in 2012 and $427,454 in 2011	292,812	326,362
Total assets	14,794,165	14,167,458
CURRENT LIABILITIES:
Accounts payable	506,423	549,532
Accrued compensation	307,369	244,173
Other accrued expenses	109,183	45,210
Income taxes payable	88,633
Total current liabilities	1,011,608	838,915
DEFERRED INCOME TAXES	338,000	338,000
Total liabilities	1,349,608	1,176,915
STOCKHOLDERS' EQUITY:
Preferred stock, par value $.10 per share; authorized 250,000 shares: issued none
Common stock, par value $.10 per share; authorized 4,750,000 shares; issued and outstanding 1,990,287 shares in 2012 and 1,984,587 shares in 2011	199,029	198,459
Additional paid-in capital	2,407,805	2,363,150
Retained earnings	10,837,723	10,428,934
Total stockholders' equity	13,444,557	12,990,543
Total liabilities and stockholders' equity	$ 14,794,165	$ 14,167,458