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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current Assets    
Cash and cash equivalents $ 1,505 $ 1,102
Treasury bills 5,227 5,248
Available-for-sale securities 2,718 3,677
Trade receivables, less allowance for doubtful accounts of $8 and $10, respectively 746 602
Inventories 1,060 1,330
Income tax receivable 1 0
Other current assets 135 75
Total current assets 11,392 12,034
Property and equipment, net 1,217 1,304
Total assets 12,609 13,338
Current Liabilities    
Accounts payable current 59 94
Accrued expenses current 265 227
Accrued income tax 0 313
Total current liabilities 324 634
Deferred income tax liability 1,022 1,455
Commitments and contingencies      
Stockholders' equity    
Common stock par value $0.10 per share; authorized 10,000,000 shares; issued and outstanding: 3,394,707 and 3,391,912 shares, respectively 339 339
Additional paid-in capital 1,746 1,575
Retained earnings 7,547 7,113
Accumulated other comprehensive income (unrealized gain on available-for-sale securities, net of income tax) 1,631 2,222
Total stockholders' equity 11,263 11,249
Total liabilities and stockholders' equity $ 12,609 $ 13,338