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Balance Sheets (USD $)
Dec. 31, 2011
Dec. 31, 2010
CURRENT ASSETS:    
Cash (Note 7) $ 1,867,165 $ 1,291,383
Short-term investments 1,835,003 2,217,990
Trade receivables, less allowance of $51,000 in 2011 and $60,000 in 2010 (Notes 5, 7, and 8) 2,180,947 1,883,428
Inventories (Notes 1 and 8) 2,234,834 2,198,064
Prepaid expenses and other assets 82,923 63,965
Income tax receivable 59,322 0
Deferred income taxes (Note 2) 144,000 157,000
Total current assets 8,404,194 7,811,830
PROPERTY, PLANT AND EQUIPMENT, at cost:    
Land and building 5,982,799 5,888,445
Machinery and equipment 3,021,053 2,455,238
Office equipment 662,160 642,100
Vehicles 235,000 234,650
Gross property, plant, and equipment, at cost 9,901,012 9,220,433
Less accumulated depreciation 4,464,110 4,207,500
Total property, plant, and equipment, at cost 5,436,902 5,012,933
INTANGIBLE ASSETS, less accumulated amortization of $427,454 in 2011 and $376,983 in 2010 (Note 3) 326,362 317,168
Total assets 14,167,458 13,141,931
CURRENT LIABILITIES:    
Accounts payable 549,532 441,830
Accrued compensation 244,173 282,196
Other accrued liabilities 45,210 45,868
Income taxes payable 0 8,090
Total current liabilities 838,915 777,984
DEFERRED INCOME TAXES (Note 2) 338,000 171,000
Total liabilities 1,176,915 948,984
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 1,984,587 shares in 2011 and 1,973,357 shares in 2010 (Note 6) 198,459 197,336
Additional paid-in capital 2,363,150 2,263,176
Retained earnings 10,428,934 9,732,435
Total stockholders' equity 12,990,543 12,192,947
Total liabilities and stockholders' equity $ 14,167,458 $ 13,141,931