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Condensed Balance Sheets (USD $)
Sep. 30, 2011
Dec. 31, 2010
CURRENT ASSETS:  
Cash$ 1,489,786$ 1,291,383
Short-term investments2,032,7652,217,990
Trade receivables, less allowance of $52,000 in 2011 and $60,000 in 20102,268,3141,883,428
Inventories2,310,8502,198,064
Prepaid expenses and other assets93,57063,965
Deferred income taxes157,000157,000
Total current assets8,352,2857,811,830
PROPERTY, PLANT AND EQUIPMENT, at cost:  
Land and building5,998,8005,888,445
Machinery and equipment2,986,3762,455,238
Office equipment693,176642,100
Vehicles234,650234,650
Gross property, plant, and equipment, at cost9,913,0029,220,433
Less accumulated depreciation4,506,6694,207,500
Total property, plant, and equipment, at cost5,406,3335,012,933
INTANGIBLE ASSETS, less accumulated amortization of $414,285 in 2011 and $376,983 in 2010334,541317,168
Total assets14,093,15913,141,931
CURRENT LIABILITIES:  
Accounts payable689,956441,830
Accrued compensation322,218282,196
Other accrued expenses70,99445,868
Income taxes payable2,8798,090
Total current liabilities1,086,047777,984
DEFERRED INCOME TAXES171,000171,000
Total liabilities1,257,047948,984
STOCKHOLDERS' EQUITY:  
Preferred stock, par value $.10 per share; authorized 250,000 shares; issued none  
Common stock, par value $.10 per share; authorized 4,750,000 shares; issued and outstanding 1,983,887 shares in 2011 and 1,973,357 shares in 2010198,389197,336
Additional paid-in capital2,345,4812,263,176
Retained earnings10,292,2429,732,435
Total stockholders' equity12,836,11212,192,947
Total liabilities and stockholders' equity$ 14,093,159$ 13,141,931