Condensed Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash	$ 1,103,355	$ 1,291,383
Short-term investments	2,231,948	2,217,990
Trade receivables, less allowance of $54,000 in 2011 and $60,000 in 2010	2,226,709	1,883,428
Inventories	2,577,605	2,198,064
Prepaid expenses and other assets	101,663	63,965
Deferred income taxes	157,000	157,000
Total current assets	8,398,280	7,811,830
PROPERTY, PLANT, AND EQUIPMENT, at cost:
Land and building	5,901,131	5,888,445
Machinery and equipment	2,510,803	2,455,238
Office equipment	688,476	642,100
Vehicles	234,650	234,650
Gross property, plant, and equipment, at cost	9,335,060	9,220,433
Less accumulated depreciation	4,404,526	4,207,500
Total property, plant, and equipment, at cost	4,930,534	5,012,933
INTANGIBLE ASSETS, less accumulated amortization of $401,941 in 2011 and $376,983 in 2010	333,936	317,168
Total assets	13,662,750	13,141,931
CURRENT LIABILITIES:
Accounts payable	462,495	441,830
Accrued compensation	359,095	282,196
Other accrued expenses	57,218	45,868
Income taxes payable	0	8,090
Total current liabilities	878,808	777,984
DEFERRED INCOME TAXES	171,000	171,000
Total liabilities	1,049,808	948,984
STOCKHOLDERS' EQUITY:
Preferred stock, par value $.10 per share; authorized 250,000 shares; issued none	0	0
Common stock, par value $.10 per share; authorized 4,750,000 shares; issued and outstanding 1,983,587 shares in 2011 and 1,973,357 shares in 2010	198,359	197,336
Additional paid-in capital	2,337,017	2,263,176
Retained earnings	10,077,566	9,732,435
Total stockholders' equity	12,612,942	12,192,947
Total liabilities and stockholders' equity	$ 13,662,750	$ 13,141,931