BALANCE SHEETS (USD $)	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents (Note 7)	$ 967,943	$ 1,867,165
Short-term investments	1,442,939	1,835,003
Trade receivables, less allowance of $43,000 in 2012 and $51,000 in 2011 (Notes 5, 7, and 9)	2,060,312	2,180,947
Inventories (Notes 1 and 9)	2,678,864	2,234,834
Prepaid expenses and other assets	124,983	82,923
Income tax receivable		59,322
Deferred income taxes (Note 2)	142,000	144,000
Total current assets	7,417,041	8,404,194
PROPERTY, PLANT, AND EQUIPMENT, at cost:
Land and building	6,063,965	5,982,799
Machinery and equipment	3,219,598	3,021,053
Office equipment	700,062	662,160
Vehicles	237,488	235,000
Gross property, plant, and equipment, at cost	10,221,113	9,901,012
Less accumulated depreciation	4,759,235	4,464,110
Net property, plant, and equipment, at cost	5,461,878	5,436,902
INTANGIBLE ASSETS, less accumulated amortization of $482,107 in 2012 and $427,454 in 2011 (Note 3)	305,357	326,362
Total assets	13,184,276	14,167,458
CURRENT LIABILITIES:
Accounts payable	593,922	549,532
Accrued compensation	265,822	244,173
Other accrued liabilities	81,635	45,210
Income taxes payable	82,152
Total current liabilities	1,023,531	838,915
DEFERRED INCOME TAXES (Note 2)	366,000	338,000
Total liabilities	1,389,531	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 1,998,475 shares in 2012 and 1,984,587 shares in 2011 (Note 6)	199,848	198,459
Additional paid-in capital	2,470,507	2,363,150
Retained earnings	9,124,390	10,428,934
Total stockholders' equity	11,794,745	12,990,543
Total liabilities and stockholders' equity	$ 13,184,276	$ 14,167,458